diff --git a/resources/pagedown/Markdown.Editor.js b/resources/pagedown/Markdown.Editor.js
index 1679918..3e71a28 100644
--- a/resources/pagedown/Markdown.Editor.js
+++ b/resources/pagedown/Markdown.Editor.js
@@ -31,7 +31,7 @@
 
         link: "Hyperlink <a> Ctrl+L",
         linkdescription: "enter link description here",
-        linkdialog: "<p><b>Insert Hyperlink</b></p><p>https://dmoj.ca/ \"optional title\"</p>",
+        linkdialog: "<p><b>Insert Hyperlink</b></p><p>https://lqdoj.edu.vn/ \"optional title\"</p>",
 
         user: "User reference",
         userexample: "enter username here",
@@ -50,11 +50,16 @@
         ulist: "Bulleted List <ul> Ctrl+U",
         litem: "List item",
 
-        heading: "Heading <h1>/<h2> Ctrl+H",
+        heading: "Heading <h2>/<h2> Ctrl+H",
         headingexample: "Heading",
 
         hr: "Horizontal Rule <hr> Ctrl+R",
 
+        adnomination: "Adnomination",
+        spoiler: "Spoiler",
+        spoilerSummary: "summary",
+        spoilerDetail: "detail",
+
         undo: "Undo - Ctrl+Z",
         redo: "Redo - Ctrl+Y",
         redomac: "Redo - Ctrl+Shift+Z",
@@ -1262,6 +1267,7 @@
             if ((key.ctrlKey || key.metaKey) && !key.altKey && !key.shiftKey) {
                 var keyCode = key.charCode || key.keyCode;
                 var keyCodeStr = String.fromCharCode(keyCode).toLowerCase();
+                var hasKey = true;
 
                 switch (keyCodeStr) {
                     case "b":
@@ -1311,16 +1317,21 @@
                             doClick(buttons.undo);
                         }
                         break;
-                }
-                switch (keyCode) {
-                    case 221:
-                        doCommand("doIndent");
-                        break;
-                    case 219:
-                        doCommand("doReverseIndent");
-                        break;
                     default:
-                        return;
+                        hasKey = false;
+                        break;
+                }
+                if (!hasKey) {
+                    switch (keyCode) {
+                        case 221:
+                            doCommand("doIndent");
+                            break;
+                        case 219:
+                            doCommand("doReverseIndent");
+                            break;
+                        default:
+                            return;
+                    }
                 }
 
                 if (key.preventDefault) {
@@ -1425,35 +1436,16 @@
             }
         };
 
+        function bindCommand(method) {
+            if (typeof method === "string")
+                method = commandManager[method];
+            return function () { method.apply(commandManager, arguments); }
+        }
+
         function setupButton(button, isEnabled) {
-
-            var normalYShift = "0px";
-            var disabledYShift = "-20px";
-            var highlightYShift = "-40px";
-            var image = button.getElementsByTagName("span")[0];
             if (isEnabled) {
-                image.style.backgroundPosition = button.XShift + " " + normalYShift;
-                button.onmouseover = function () {
-                    image.style.backgroundPosition = this.XShift + " " + highlightYShift;
-                };
-
-                button.onmouseout = function () {
-                    image.style.backgroundPosition = this.XShift + " " + normalYShift;
-                };
-
-                // IE tries to select the background image "button" text (it's
-                // implemented in a list item) so we have to cache the selection
-                // on mousedown.
-                if (uaSniffed.isIE) {
-                    button.onmousedown = function () {
-                        if (doc.activeElement && doc.activeElement !== panels.input) { // we're not even in the input box, so there's no selection
-                            return;
-                        }
-                        panels.ieCachedRange = document.selection.createRange();
-                        panels.ieCachedScrollTop = panels.input.scrollTop;
-                    };
-                }
-
+                button.classList.add("wmd-button-active");
+                button.classList.remove("wmd-button-inactive");
                 if (!button.isHelp) {
                     button.onclick = function () {
                         if (this.onmouseout) {
@@ -1465,19 +1457,14 @@
                 }
             }
             else {
-                image.style.backgroundPosition = button.XShift + " " + disabledYShift;
-                button.onmouseover = button.onmouseout = button.onclick = function () { };
+                console.log(button);
+                button.classList.remove("wmd-button-active");
+                button.classList.add("wmd-button-inactive");
+                button.onclick = function () { };
             }
         }
 
-        function bindCommand(method) {
-            if (typeof method === "string")
-                method = commandManager[method];
-            return function () { method.apply(commandManager, arguments); }
-        }
-
         function makeSpritedButtonRow() {
-
             var buttonBar = panels.buttonBar;
 
             var normalYShift = "0px";
@@ -1488,17 +1475,12 @@
             buttonRow.id = "wmd-button-row" + postfix;
             buttonRow.className = 'wmd-button-row';
             buttonRow = buttonBar.appendChild(buttonRow);
-            var xPosition = 0;
-            var makeButton = function (id, title, XShift, textOp) {
+
+            var makeButton = function (id, title, textOp) {
                 var button = document.createElement("li");
-                button.className = "wmd-button";
-                button.style.left = xPosition + "px";
-                xPosition += 25;
-                var buttonImage = document.createElement("span");
+                button.className = "wmd-button " + id;
                 button.id = id + postfix;
-                button.appendChild(buttonImage);
                 button.title = title;
-                button.XShift = XShift;
                 if (textOp)
                     button.textOp = textOp;
                 setupButton(button, true);
@@ -1510,37 +1492,39 @@
                 spacer.className = "wmd-spacer wmd-spacer" + num;
                 spacer.id = "wmd-spacer" + num + postfix;
                 buttonRow.appendChild(spacer);
-                xPosition += 25;
             }
 
-            buttons.bold = makeButton("wmd-bold-button", getString("bold"), "0px", bindCommand("doBold"));
-            buttons.italic = makeButton("wmd-italic-button", getString("italic"), "-20px", bindCommand("doItalic"));
+            buttons.bold = makeButton("wmd-bold-button", getString("bold"), bindCommand("doBold"));
+            buttons.italic = makeButton("wmd-italic-button", getString("italic"), bindCommand("doItalic"));
             makeSpacer(1);
-            buttons.latex = makeButton("wmd-latex-button", getString("latex"), "-40px", bindCommand("doLatex"));
-            buttons.displaylatex = makeButton("wmd-latex-button-display", getString("latexdisplay"), "-60px", bindCommand("doLatexDisplay"));
+            buttons.latex = makeButton("wmd-latex-button", getString("latex"), bindCommand("doLatex"));
+            buttons.displaylatex = makeButton("wmd-latex-button-display", getString("latexdisplay"), bindCommand("doLatexDisplay"));
             makeSpacer(2);
-            buttons.link = makeButton("wmd-link-button", getString("link"), "-80px", bindCommand(function (chunk, postProcessing) {
+            buttons.link = makeButton("wmd-link-button", getString("link"), bindCommand(function (chunk, postProcessing) {
                 return this.doLinkOrImage(chunk, postProcessing, false);
             }));
 
-            buttons.user = makeButton("wmd-user-reference-button", getString("user"), "-100px", bindCommand("doUserReference"));
+            buttons.user = makeButton("wmd-user-reference-button", getString("user"), bindCommand("doUserReference"));
 
-            buttons.quote = makeButton("wmd-quote-button", getString("quote"), "-120px", bindCommand("doBlockquote"));
-            buttons.code = makeButton("wmd-code-button", getString("code"), "-140px", bindCommand("doCode"));
-            buttons.image = makeButton("wmd-image-button", getString("image"), "-160px", bindCommand(function (chunk, postProcessing) {
+            buttons.quote = makeButton("wmd-quote-button", getString("quote"), bindCommand("doBlockquote"));
+            buttons.code = makeButton("wmd-code-button", getString("code"), bindCommand("doCode"));
+            buttons.image = makeButton("wmd-image-button", getString("image"), bindCommand(function (chunk, postProcessing) {
                 return this.doLinkOrImage(chunk, postProcessing, true);
             }));
             makeSpacer(3);
-            buttons.olist = makeButton("wmd-olist-button", getString("olist"), "-180px", bindCommand(function (chunk, postProcessing) {
+            buttons.olist = makeButton("wmd-olist-button", getString("olist"), bindCommand(function (chunk, postProcessing) {
                 this.doList(chunk, postProcessing, true);
             }));
-            buttons.ulist = makeButton("wmd-ulist-button", getString("ulist"), "-200px", bindCommand(function (chunk, postProcessing) {
+            buttons.ulist = makeButton("wmd-ulist-button", getString("ulist"), bindCommand(function (chunk, postProcessing) {
                 this.doList(chunk, postProcessing, false);
             }));
-            buttons.heading = makeButton("wmd-heading-button", getString("heading"), "-220px", bindCommand("doHeading"));
-            buttons.hr = makeButton("wmd-hr-button", getString("hr"), "-240px", bindCommand("doHorizontalRule"));
+            buttons.heading = makeButton("wmd-heading-button", getString("heading"), bindCommand("doHeading"));
+            buttons.hr = makeButton("wmd-hr-button", getString("hr"), bindCommand("doHorizontalRule"));
             makeSpacer(3);
-            buttons.undo = makeButton("wmd-undo-button", getString("undo"), "-260px", null);
+            buttons.spoiler = makeButton("wmd-adnomination-button", getString("adnomination"), bindCommand("doAdnomination"));
+            buttons.spoiler = makeButton("wmd-spoiler-button", getString("spoiler"), bindCommand("doSpoiler"));
+            makeSpacer(4);
+            buttons.undo = makeButton("wmd-undo-button", getString("undo"), null);
             buttons.undo.execute = function (manager) { if (manager) manager.undo(); };
 
             var redoTitle = /win/.test(nav.platform.toLowerCase()) ?
@@ -1550,27 +1534,11 @@
             buttons.redo = makeButton("wmd-redo-button", redoTitle, "-280px", null);
             buttons.redo.execute = function (manager) { if (manager) manager.redo(); };
 
-            if (helpOptions) {
-                var helpButton = document.createElement("li");
-                var helpButtonImage = document.createElement("span");
-                helpButton.appendChild(helpButtonImage);
-                helpButton.className = "wmd-button wmd-help-button";
-                helpButton.id = "wmd-help-button" + postfix;
-                helpButton.XShift = "-300px";
-                helpButton.isHelp = true;
-                helpButton.style.right = "0px";
-                helpButton.title = getString("help");
-                helpButton.onclick = helpOptions.handler;
-
-                setupButton(helpButton, true);
-                buttonRow.appendChild(helpButton);
-                buttons.help = helpButton;
-            }
-
             setUndoRedoButtonStates();
         }
 
         function setUndoRedoButtonStates() {
+            console.log(undoManager.canUndo());
             if (undoManager) {
                 setupButton(buttons.undo, undoManager.canUndo());
                 setupButton(buttons.redo, undoManager.canRedo());
@@ -1954,6 +1922,42 @@
         chunk.before = chunk.before.replace(/(^|\n)([ ]{0,4})(.*)$/, "$1$3");
     }
 
+    commandProto.doReverseIndent = function(chunk, postProcessing) {
+        if (chunk.selection) {
+            var selectedLines = chunk.selection.split("\n");
+            for (var i = 1; i < selectedLines.length; i++) {
+                selectedLines[i] = selectedLines[i].replace(/^([ ]{0,4})(.*)$/, "$2");
+            }
+            chunk.selection = selectedLines.join("\n");
+        }
+        // Reindent the current line
+        chunk.before = chunk.before.replace(/(^|\n)([ ]{0,4})(.*)$/, "$1$3");
+    }
+
+    commandProto.doSpoiler = function(chunk, postProcessing) {
+        chunk.selection = "";
+        if (chunk.before && !/\s$/.test(chunk.before)) {
+            commandProto.doAutoindent(chunk, postProcessing);
+        }
+        chunk.before += "??? \"" + this.getString("spoilerSummary") + "\"";
+        commandProto.doAutoindent(chunk, postProcessing);
+        chunk.before += "    ";
+        chunk.selection = this.getString("spoilerDetail");
+        chunk.after = "\n" + chunk.after;
+    }
+
+    commandProto.doAdnomination = function(chunk, postProcessing) {
+        chunk.selection = "";
+        if (chunk.before && !/\s$/.test(chunk.before)) {
+            commandProto.doAutoindent(chunk, postProcessing);
+        }
+        chunk.before += "!!! note \"" + this.getString("spoilerSummary") + "\"";
+        commandProto.doAutoindent(chunk, postProcessing);
+        chunk.before += "    ";
+        chunk.selection = this.getString("spoilerDetail");
+        chunk.after = "\n" + chunk.after;
+    }
+
     // Hitting enter will put your cursor on the next line
     // at the current indent level.
     commandProto.doAutoindent = function (chunk, postProcessing) {
@@ -2157,38 +2161,30 @@
         // line or is multiline.
         if ((!hasTextAfter && !hasTextBefore) || /\n/.test(chunk.selection)) {
 
-            chunk.before = chunk.before.replace(/[ ]{4}$/,
-                function (totalMatch) {
-                    chunk.selection = totalMatch + chunk.selection;
-                    return "";
-                });
+            // Use backticks (`) to delimit the code block.
 
-            var nLinesBack = 1;
-            var nLinesForward = 1;
+            chunk.trimWhitespace();
+            chunk.findTags(/```/, /```/);
 
-            if (/(\n|^)(\t|[ ]{4,}).*\n$/.test(chunk.before)) {
-                nLinesBack = 0;
+            if (!chunk.startTag && !chunk.endTag) {
+                chunk.startTag = "```\n";
+                chunk.endTag = "\n```";
+                if (!chunk.selection) {
+                    chunk.selection = this.getString("codeexample");
+                }
             }
-            if (/^\n(\t|[ ]{4,})/.test(chunk.after)) {
-                nLinesForward = 0;
-            }
-
-            chunk.skipLines(nLinesBack, nLinesForward);
-
-            if (!chunk.selection) {
-                chunk.startTag = "    ";
-                chunk.selection = this.getString("codeexample");
+            else if (chunk.endTag && !chunk.startTag) {
+                chunk.before += chunk.endTag;
+                chunk.endTag = "";
             }
             else {
-                if (/^[ ]{0,3}\S/m.test(chunk.selection)) {
-                    if (/\n/.test(chunk.selection))
-                        chunk.selection = chunk.selection.replace(/^/gm, "    ");
-                    else // if it's not multiline, do not select the four added spaces; this is more consistent with the doList behavior
-                        chunk.before += "    ";
-                }
-                else {
-                    chunk.selection = chunk.selection.replace(/^[ ]{4}/gm, "");
-                }
+                chunk.startTag = chunk.endTag = "";
+            }
+            if (!/(^|\n)$/.test(chunk.before)) {
+                chunk.startTag = '\n' + chunk.startTag;
+            }
+            if (!/^(\n|$)/.test(chunk.after)) {
+                chunk.endTag += '\n';
             }
         }
         else {
diff --git a/resources/pagedown/demo/browser/demo.css b/resources/pagedown/demo/browser/demo.css
index 5860ba8..5f8b057 100644
--- a/resources/pagedown/demo/browser/demo.css
+++ b/resources/pagedown/demo/browser/demo.css
@@ -11,109 +11,162 @@ body
 	min-width: 500px;
 }
 
-.wmd-button-bar 
-{
-	width: 100%;
-	background-color: Silver; 
+.wmd-button-bar {
+    width: 100%;
+    background-color: white;
 }
 
-.wmd-input 
-{ 
-	height: 300px;
-	width: 100%;
-	background-color: Gainsboro;
-	border: 1px solid DarkGray;
+.wmd-input {
+    height: 300px;
+    width: 100%;
+    background: #fff;
+    border: 1px solid DarkGray;
+    font-family: Consolas, "Liberation Mono", Monaco, "Courier New", monospace !important;
 }
 
-.wmd-preview 
-{ 
-	background-color: #c0e0ff; 
+.wmd-preview {
+    background: none;
+    word-wrap: break-word;
 }
 
-.wmd-button-row 
-{
-	position: relative; 
-	margin-left: 5px;
-	margin-right: 5px;
-	margin-bottom: 5px;
-	margin-top: 10px;
-	padding: 0px;  
-	height: 20px;
+.wmd-button-row {
+    margin: 10px 5px 5px;
+    padding: 0;
+}
+
+.wmd-button {
+    display: inline-flex;
+    list-style: none;
+    width: 20px;
+    height: 20px;
+    background-repeat: no-repeat;
+    background-size: 14px 14px;
+    background-position: center;
+    border-radius: 3px;
+    cursor: pointer;
+    padding-left: 2px;
+    padding-right: 3px;
+}
+
+.wmd-bold-button {
+    background-image: url("pagedown/resources/bold.svg");
+}
+
+.wmd-italic-button {
+    background-image: url("pagedown/resources/italic.svg");
+}
+
+.wmd-latex-button {
+    background-image: url("pagedown/resources/latex.svg");
+}
+
+.wmd-latex-button-display {
+    background-image: url("pagedown/resources/latex-display.svg");
+}
+
+.wmd-link-button {
+    background-image: url("pagedown/resources/link.svg");
+}
+
+.wmd-user-reference-button {
+    background-image: url("pagedown/resources/user.svg");
+}
+
+.wmd-quote-button {
+    background-image: url("pagedown/resources/blockquote.svg");
+}
+
+.wmd-code-button {
+    background-image: url("pagedown/resources/code.svg");
+}
+
+.wmd-image-button {
+    background-image: url("pagedown/resources/image.svg");
+}
+
+.wmd-olist-button {
+    background-image: url("pagedown/resources/olist.svg");
+    background-size: 18px;
+}
+
+.wmd-ulist-button {
+    background-image: url("pagedown/resources/ulist.svg");
+    background-size: 18px;
+}
+
+.wmd-heading-button {
+    background-image: url("pagedown/resources/heading.svg");
+}
+
+.wmd-hr-button {
+    background-image: url("pagedown/resources/hr.svg");
+}
+
+.wmd-undo-button {
+    background-image: url("pagedown/resources/undo.svg");
+    background-size: 18px;
+}
+
+.wmd-redo-button {
+    background-image: url("pagedown/resources/redo.svg");
+    background-size: 18px;
+}
+
+.wmd-button-active:hover {
+    background-color: lightgray;
+}
+
+.wmd-button-inactive {
+    filter: invert(88%) sepia(1%) saturate(0%) hue-rotate(278deg) brightness(98%) contrast(91%);
 }
 
 .wmd-spacer
 {
-	width: 1px; 
-	height: 20px; 
-	margin-left: 14px;
-	
-	position: absolute;
-	background-color: Silver;
-	display: inline-block; 
-	list-style: none;
-}
-
-.wmd-button {
+    display: inline-flex;
     width: 20px;
-    height: 20px;
-    padding-left: 2px;
-    padding-right: 3px;
-    position: absolute;
-    display: inline-block;
-    list-style: none;
-    cursor: pointer;
 }
 
-.wmd-button > span {
-    background-image: url(../../wmd-buttons.png);
-    background-repeat: no-repeat;
-    background-position: 0px 0px;
-    width: 20px;
-    height: 20px;
-    display: inline-block;
+.wmd-prompt-background {
+    background-color: Black;
 }
 
-.wmd-spacer1
-{
-    left: 50px;
-}
-.wmd-spacer2
-{
-    left: 175px;
-}
-.wmd-spacer3
-{
-    left: 300px;
-}
-
-
-
-
-.wmd-prompt-background
-{
-	background-color: Black;
-}
-
-.wmd-prompt-dialog
-{
-	border: 1px solid #999999;
-	background-color: #F5F5F5;
+.wmd-prompt-dialog {
+    border: 1px solid #999999;
+    background-color: #F5F5F5;
 }
 
 .wmd-prompt-dialog > div {
-	font-size: 0.8em;
-	font-family: arial, helvetica, sans-serif;
+    font-size: 0.8em;
+    font-family: arial, helvetica, sans-serif;
 }
 
-
 .wmd-prompt-dialog > form > input[type="text"] {
-	border: 1px solid #999999;
-	color: black;
+    border: 1px solid #999999;
+    color: black;
 }
 
-.wmd-prompt-dialog > form > input[type="button"]{
-	border: 1px solid #888888;
-	font-family: trebuchet MS, helvetica, sans-serif;
-	font-size: 0.8em;
-	font-weight: bold;
+.wmd-prompt-dialog > form > input[type="button"] {
+    border: 1px solid #888888;
+    font-family: trebuchet MS, helvetica, sans-serif;
+    font-size: 0.8em;
+    font-weight: bold;
 }
+
+.wmd-wrapper {
+    padding-right: 0 !important;
+}
+
+.wmd-preview {
+    margin-top: 15px;
+    padding: 7px;
+    background: white;
+    line-height: 1.5em;
+    font-size: 1em;
+    border: 1px solid #a9a9a9;
+    border-radius: 5px;
+    box-sizing: border-box;
+}
+
+.wmd-preview:empty {
+    display: none;
+}
\ No newline at end of file
diff --git a/resources/pagedown/resources/adnomination.svg b/resources/pagedown/resources/adnomination.svg
new file mode 100644
index 0000000..f227a32
--- /dev/null
+++ b/resources/pagedown/resources/adnomination.svg
@@ -0,0 +1 @@
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diff --git a/resources/pagedown/resources/spoiler.svg b/resources/pagedown/resources/spoiler.svg
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+++ b/resources/pagedown/resources/undo.svg
@@ -0,0 +1 @@
+<?xml version="1.0" ?><svg height="48px" id="svg11300" width="48px" xmlns="http://www.w3.org/2000/svg" xmlns:cc="http://creativecommons.org/ns#" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd" xmlns:svg="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><defs id="defs3"><linearGradient id="linearGradient2326"><stop id="stop2328" offset="0" style="stop-color:#ffffff;stop-opacity:1;"/><stop id="stop2330" offset="1" style="stop-color:#ffffff;stop-opacity:0;"/></linearGradient><linearGradient id="linearGradient2316"><stop id="stop2318" offset="0" style="stop-color:#c4a000;stop-opacity:1;"/><stop id="stop2320" offset="1" style="stop-color:#c4a000;stop-opacity:0;"/></linearGradient><linearGradient id="linearGradient2308"><stop id="stop2310" offset="0" 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\ No newline at end of file
diff --git a/resources/pagedown/resources/user.svg b/resources/pagedown/resources/user.svg
new file mode 100644
index 0000000..8474bbd
--- /dev/null
+++ b/resources/pagedown/resources/user.svg
@@ -0,0 +1 @@
+<?xml version="1.0" ?><svg id="line" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg"><defs><style>.cls-1{fill:#bfffc8;}.cls-2{fill:#00df8e;}</style></defs><title/><path class="cls-1" d="M16,13.18a6.09,6.09,0,1,1,6.09-6.09A6.09,6.09,0,0,1,16,13.18ZM16,3a4.09,4.09,0,1,0,4.09,4.09A4.09,4.09,0,0,0,16,3Z"/><path class="cls-2" d="M23,31H9a5.46,5.46,0,0,1-5.45-5.45A10.56,10.56,0,0,1,14.09,15h3.82A10.56,10.56,0,0,1,28.45,25.55,5.46,5.46,0,0,1,23,31ZM14.09,17a8.55,8.55,0,0,0-8.54,8.55A3.46,3.46,0,0,0,9,29H23a3.46,3.46,0,0,0,3.45-3.45A8.55,8.55,0,0,0,17.91,17Z"/></svg>
\ No newline at end of file
diff --git a/resources/pagedown_widget.css b/resources/pagedown_widget.css
index 0dff7ee..0fcb70b 100644
--- a/resources/pagedown_widget.css
+++ b/resources/pagedown_widget.css
@@ -23,53 +23,108 @@
 }
 
 .wmd-button-row {
-    position: relative;
     margin: 10px 5px 5px;
     padding: 0;
-    height: 20px;
-    overflow-x: none;
-}
-
-.wmd-spacer {
-    width: 1px;
-    height: 20px;
-    margin-left: 14px;
-    position: absolute;
-    display: inline-block;
-    list-style: none;
 }
 
 .wmd-button {
+    display: inline-flex;
+    list-style: none;
     width: 20px;
     height: 20px;
+    background-repeat: no-repeat;
+    background-size: 14px 14px;
+    background-position: center;
+    border-radius: 3px;
+    cursor: pointer;
     padding-left: 2px;
     padding-right: 3px;
-    position: absolute;
-    display: inline-block;
-    list-style: none;
-    cursor: pointer;
 }
 
-.wmd-button > span {
-    background: url(pagedown/wmd-buttons.png) no-repeat 0 0;
+.wmd-bold-button {
+    background-image: url("pagedown/resources/bold.svg");
+}
+
+.wmd-italic-button {
+    background-image: url("pagedown/resources/italic.svg");
+}
+
+.wmd-latex-button {
+    background-image: url("pagedown/resources/latex.svg");
+}
+
+.wmd-latex-button-display {
+    background-image: url("pagedown/resources/latex-display.svg");
+}
+
+.wmd-link-button {
+    background-image: url("pagedown/resources/link.svg");
+}
+
+.wmd-user-reference-button {
+    background-image: url("pagedown/resources/user.svg");
+}
+
+.wmd-quote-button {
+    background-image: url("pagedown/resources/blockquote.svg");
+}
+
+.wmd-code-button {
+    background-image: url("pagedown/resources/code.svg");
+}
+
+.wmd-image-button {
+    background-image: url("pagedown/resources/image.svg");
+}
+
+.wmd-olist-button {
+    background-image: url("pagedown/resources/olist.svg");
+    background-size: 18px;
+}
+
+.wmd-ulist-button {
+    background-image: url("pagedown/resources/ulist.svg");
+    background-size: 18px;
+}
+
+.wmd-heading-button {
+    background-image: url("pagedown/resources/heading.svg");
+}
+
+.wmd-hr-button {
+    background-image: url("pagedown/resources/hr.svg");
+}
+
+.wmd-undo-button {
+    background-image: url("pagedown/resources/undo.svg");
+    background-size: 18px;
+}
+
+.wmd-redo-button {
+    background-image: url("pagedown/resources/redo.svg");
+    background-size: 18px;
+}
+
+.wmd-adnomination-button {
+    background-image: url("pagedown/resources/adnomination.svg");
+}
+
+.wmd-spoiler-button {
+    background-image: url("pagedown/resources/spoiler.svg");
+}
+
+.wmd-button-active:hover {
+    background-color: lightgray;
+}
+
+.wmd-button-inactive {
+    filter: invert(88%) sepia(1%) saturate(0%) hue-rotate(278deg) brightness(98%) contrast(91%);
+}
+
+.wmd-spacer
+{
+    display: inline-flex;
     width: 20px;
-    height: 20px;
-    display: inline-block;
-}
-
-.wmd-spacer1 {
-    left: 50px;
-    display: None;
-}
-
-.wmd-spacer2 {
-    left: 175px;
-    display: None;
-}
-
-.wmd-spacer3 {
-    left: 300px;
-    display: None;
 }
 
 .wmd-prompt-background {
@@ -115,27 +170,4 @@
 
 .wmd-preview:empty {
     display: none;
-}
-
-.wmd-preview h1, .wmd-preview h2, .wmd-preview h3, .wmd-preview h4, .wmd-preview h5, .wmd-preview h6 {
-    font-weight: bold !important;
-    margin-left: 0 !important;
-}
-
-.wmd-preview:not(.dmmd-preview) h1 {
-    font-size: 1.6em !important;
-    margin: 0 !important;
-    padding: 0 !important;
-}
-
-.wmd-preview:not(.dmmd-preview) h2 {
-    font-size: 1.4em !important
-}
-
-.wmd-preview:not(.dmmd-preview) h3 {
-    font-size: 1em !important
-}
-
-.wmd-preview:not(.dmmd-preview) h4, .wmd-preview:not(.dmmd-preview) h5, .wmd-preview:not(.dmmd-preview) h6 {
-    font-size: .9em !important
-}
+}
\ No newline at end of file