Fix various UI problems (#34243)

Also fix #34242

web_src/css/markup/content.css

@@ -529,20 +529,6 @@
   margin: 0 0.25em;
 }
 
-.file-revisions-btn {
-  display: block;
-  float: left;
-  margin-bottom: 2px !important;
-  padding: 11px !important;
-  margin-right: 10px !important;
-}
-
-.file-revisions-btn i {
-  -webkit-touch-callout: none;
-  -webkit-user-select: none;
-  user-select: none;
-}
-
 .markup-content-iframe {
   display: block;
   border: none;