change e testcase table UI and add CPP validator

resources/base.scss

@@ -180,7 +180,7 @@ header {
     }
 
     a {
-        color: #FFF;
+        color: #9c3706;
     }
 
     li {
@@ -206,7 +206,7 @@ header {
             }
 
             & > span {
-                color: #eee;
+                color: darkslateblue;
                 vertical-align: middle;
                 display: inline;
                 margin-top: 11px;
@@ -223,15 +223,15 @@ header {
 }
 
 #nav-container {
-    background: $widget_black;
+    background: linear-gradient(#c1e9fd, #63c8f9);
 
-    // opacity: 0.77
+    // opacity: 0.77;
     // filter: alpha(opacity=77)
     height: 100%;
 }
 
 #navigation {
-    position: fixed;
+    position: relative;
     top: 0;
     left: 0;
     right: 0;
@@ -276,7 +276,7 @@ nav {
                 display: inline-block;
                 text-decoration: none;
                 vertical-align: middle;
-                color: #3e452c;
+                color: #9c3706;
                 padding: 13px 7px;
                 height: 18px;
 
@@ -371,7 +371,7 @@ hr {
 }
 
 #content {
-    margin: 52px auto auto;
+    margin: 1em auto auto;
 
     // Header
     width: 90%;