Edit C:\dspace\webapps\xmlui\themes\Mirage\lib\css\helper.css

/**
 * The contents of this file are subject to the license and copyright
 * detailed in the LICENSE and NOTICE files at the root of the source
 * tree and available online at
 *
 * http://www.dspace.org/license/
 */
/*
 * helper.css
 *
 * Non-semantic helper classes
 */

/* for image replacement */
.ir { display:block; text-indent:-999em; overflow:hidden; background-repeat: no-repeat; }

/* Hide for both screenreaders and browsers
   css-discuss.incutio.com/wiki/Screenreader_Visibility */
.hidden { display:none; visibility:hidden; }

/* Hide only visually, but have it available for screenreaders
   www.webaim.org/techniques/css/invisiblecontent/
   Solution from: j.mp/visuallyhidden - Thanks Jonathan Neal! */
.visuallyhidden { position:absolute !important;
  clip: rect(1px 1px 1px 1px); /* IE6, IE7 */
  clip: rect(1px, 1px, 1px, 1px); }

/* Hide visually and from screenreaders, but maintain layout */
.invisible { visibility: hidden; }

/* >> The Magnificent CLEARFIX << */
.clearfix:after { content: "."; display: block; height: 0; clear: both; visibility: hidden; }
.clearfix { display: inline-block; }
* html .clearfix { height: 1%; } /* Hides from IE-mac \*/
.clearfix { display: block; }

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