MediaWiki:Gadget-sound-styles.css

/* These styles are applied before JS is loaded, to create the final layout
    to prevent any FOUC */
 .client-js .sound-audio {
   display: none;
 }
 .client-js .sound-title::after {
   content: '';
   display: inline-block;
   width: 1.143em;
   height: 1.143em;   
   margin-left: 0.286em;   
   vertical-align: text-top; }