Fixed css, compiled translation file.

boards/static/css/base.css

@@ -7,6 +7,6
     min-height: 0;
 }
 
-.mark-btn {
+.mark_btn {
     cursor: pointer;
 }
  No newline at end of file

boards/static/css/md/base_page.css

@@ -192,7 +192,10 blockquote {
 .mark_btn {
     padding: 2px 4px;
     border: 1px solid;
-    cursor: pointer;
+}
+
+.mark_btn:hover {
+    background: #555;
 }
 
 .quote {