diff --git a/resources/newProblem.scss b/resources/newProblem.scss
index f516e47..f9dcede 100644
--- a/resources/newProblem.scss
+++ b/resources/newProblem.scss
@@ -38,46 +38,6 @@
     }
 }
 
-@media (min-width: 576px) {
-    .d-sm-flex {
-        display: -webkit-box !important;
-        display: -ms-flexbox !important;
-        display: flex !important;
-    }
-}
-
-@media (min-width: 768px) {
-    .d-md-flex {
-        display: -webkit-box !important;
-        display: -ms-flexbox !important;
-        display: flex !important;
-    }
-}
-
-@media (min-width: 992px) {
-    .d-lg-flex {
-        display: -webkit-box !important;
-        display: -ms-flexbox !important;
-        display: flex !important;
-    }
-}
-
-@media (min-width: 1200px) {
-    .d-xl-flex {
-        display: -webkit-box !important;
-        display: -ms-flexbox !important;
-        display: flex !important;
-    }
-}
-
-@media print {
-    .d-print-flex {
-        display: -webkit-box !important;
-        display: -ms-flexbox !important;
-        display: flex !important;
-    }
-}
-
 .justify-content-center {
     -webkit-box-pack: center !important;
     -ms-flex-pack: center !important;
@@ -101,94 +61,6 @@
     align-self: center !important;
 }
 
-@media (min-width: 576px) {
-    .justify-content-sm-center {
-        -webkit-box-pack: center !important;
-        -ms-flex-pack: center !important;
-        justify-content: center !important;
-    }
-    .align-items-sm-center {
-        -webkit-box-align: center !important;
-        -ms-flex-align: center !important;
-        align-items: center !important;
-    }
-    .align-content-sm-center {
-        -ms-flex-line-pack: center !important;
-        align-content: center !important;
-    }
-    .align-self-sm-center {
-        -ms-flex-item-align: center !important;
-        -ms-grid-row-align: center !important;
-        align-self: center !important;
-    }
-}
-
-@media (min-width: 768px) {
-    .justify-content-md-center {
-        -webkit-box-pack: center !important;
-        -ms-flex-pack: center !important;
-        justify-content: center !important;
-    }
-    .align-items-md-center {
-        -webkit-box-align: center !important;
-        -ms-flex-align: center !important;
-        align-items: center !important;
-    }
-    .align-content-md-center {
-        -ms-flex-line-pack: center !important;
-        align-content: center !important;
-    }
-    .align-self-md-center {
-        -ms-flex-item-align: center !important;
-        -ms-grid-row-align: center !important;
-        align-self: center !important;
-    }
-}
-
-@media (min-width: 992px) {
-    .justify-content-lg-center {
-        -webkit-box-pack: center !important;
-        -ms-flex-pack: center !important;
-        justify-content: center !important;
-    }
-    .align-items-lg-center {
-        -webkit-box-align: center !important;
-        -ms-flex-align: center !important;
-        align-items: center !important;
-    }
-    .align-content-lg-center {
-        -ms-flex-line-pack: center !important;
-        align-content: center !important;
-    }
-    .align-self-lg-center {
-        -ms-flex-item-align: center !important;
-        -ms-grid-row-align: center !important;
-        align-self: center !important;
-    }
-}
-
-@media (min-width: 1200px) {
-    .justify-content-xl-center {
-        -webkit-box-pack: center !important;
-        -ms-flex-pack: center !important;
-        justify-content: center !important;
-    }
-    .align-items-xl-center {
-        -webkit-box-align: center !important;
-        -ms-flex-align: center !important;
-        align-items: center !important;
-    }
-    .align-content-xl-center {
-        -ms-flex-line-pack: center !important;
-        align-content: center !important;
-    }
-    .align-self-xl-center {
-        -ms-flex-item-align: center !important;
-        -ms-grid-row-align: center !important;
-        align-self: center !important;
-    }
-}
-
 body {
     font-size: 15px;
     line-height: 1.8;