fix browse file css

app/assets/stylesheets/gitlab_bootstrap/files.scss

@@ -9,7 +9,7 @@
   .file_title {
     border-bottom: 1px solid #bbb;
-    @include bg-gray-gradient;
+    @include bg-dark-gray-gradient;
     margin: 0;
     font-weight: normal;
     font-weight: bold;

app/assets/stylesheets/highlight/white.scss

-table.highlighttable
-{
+table.highlighttable {
   margin:0px;
   padding:0px;
   font-size:12px;
   table-layout:fixed;
   background: #EEE;
+  box-shadow: none;
+  border: none;
+  td.linenos {
+    background:#eee;
+    border-left:none;
+  }
+  td.code {
+    border-right:none;
+  }
 }
+
 td.code,
 td.linenos{
   padding:0;