SemanSemantic-UItic-UI/build/uncompressed/modules/tab.css

/*
 * # Semantic Button
 * http://github.com/quirkyinc/semantic
 *
 *
 * Copyright 2013 Contributors
 * Released under the MIT license
 * http://opensource.org/licenses/MIT
 *
 * Released: April 17 2013
 */
/*******************************
           UI Tabs 
*******************************/
.ui.tab {
  display: none;
}
.ui.tab.active,
.ui.tab.open {
  display: block;
}
/*******************************
             States
*******************************/
/*--------------------
       Loading
---------------------*/
.ui.tab.loading {
  position: relative;
  overflow: hidden;
  display: block;
  min-height: 250px;
  text-indent: -10000px;
}
.ui.tab.loading * {
  position: relative !important;
  left: -10000px !important;
}
.ui.tab.loading:after {
  position: absolute;
  top: 50px;
  left: 50%;
  content: 'Loading...';
  margin-left: -32px;
  text-indent: 5px;
  color: rgba(0, 0, 0, 0.4);
  width: 100%;
  height: 100%;
  padding-top: 75px;
  background: url(../images/loader-large.gif) no-repeat 0px 0px;
  visibility: visible;
}