HFP-2860 Fix BG color + overflow

styles/css/cke-contents.css

-@import url(../../ckeditor/contents.css);code{color:#3d3d3d;background:#e0e0e0;border-radius:2px;padding:0 5px}pre>code{padding:5px;display:block;line-height:normal;border:1px solid #c7c7c7;border-left-width:4px}
+@import url(../../ckeditor/contents.css);code{color:#3d3d3d;background:#e0e0e0;border-radius:2px;padding:0 5px}pre>code{background-color:#d1d1d1;padding:5px;display:block;line-height:normal;border:1px solid #c7c7c7;border-left-width:4px;max-width:100%;white-space:nowrap;overflow:auto}

styles/scss/cke-contents.scss

@@ -7,9 +7,13 @@ code {
   padding: 0 5px;
 }
 pre > code {
+  background-color: #d1d1d1;
   padding: 5px;
   display: block;
   line-height: normal;
   border: 1px solid #c7c7c7;
   border-left-width: 4px;
+  max-width: 100%;
+  white-space: nowrap;
+  overflow: auto;
 }