mol-plugin: animation controls tweak

src/mol-plugin/skin/base/components/temp.scss

@@ -198,7 +198,7 @@
         float: left;
         margin-right: $control-spacing;
         position: relative;
-        background-color: $msp-form-control-background;
+        // background-color: $msp-form-control-background;
 
         .msp-animation-viewport-controls-select {
             width: 290px;