SemanSemantic-UItic-UI/dist/components/video.css

 /*
 * # Semantic UI
 * https://github.com/Semantic-Org/Semantic-UI
 * http://www.semantic-ui.com/
 *
 * Copyright 2014 Contributors
 * Released under the MIT license
 * http://opensource.org/licenses/MIT
 *
 */



/*******************************
            Video
*******************************/

.ui.video {
  background-color: #dddddd;
  position: relative;
  max-width: 100%;
  padding-bottom: 56.25%;
  height: 0px;
  overflow: hidden;
}

/*--------------
     Content
---------------*/


/* Placeholder Image */
.ui.video .placeholder {
  background-color: #333333;
}

/* Play Icon Overlay */
.ui.video .play {
  cursor: pointer;
  position: absolute;
  top: 0px;
  left: 0px;
  z-index: 10;
  width: 100%;
  height: 100%;
  opacity: 0.8;
  -webkit-transition: opacity 0.3s;
          transition: opacity 0.3s;
}
.ui.video .play.icon:before {
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 11;
  background: rgba(0, 0, 0, 0.3);
  width: 8rem;
  height: 8rem;
  line-height: 8rem;
  border-radius: 500rem;
  color: #ffffff;
  font-size: 8rem;
  text-shadow: none;
  -webkit-transform: translateX(-50%) translateY(-50%);
      -ms-transform: translateX(-50%) translateY(-50%);
          transform: translateX(-50%) translateY(-50%);
}
.ui.video .placeholder {
  position: absolute;
  top: 0px;
  left: 0px;
  display: block;
  width: 100%;
  height: 100%;
}

/* IFrame Embed */
.ui.video .embed iframe,
.ui.video .embed embed,
.ui.video .embed object {
  position: absolute;
  border: none;
  width: 100%;
  height: 100%;
  top: 0px;
  left: 0px;
  margin: 0em;
  padding: 0em;
}


/*******************************
            States
*******************************/


/*--------------
    Hover
---------------*/

.ui.video .play:hover {
  opacity: 1;
}

/*--------------
     Active
---------------*/

.ui.video.active .play,
.ui.video.active .placeholder {
  display: none;
}
.ui.video.active .embed {
  display: inline;
}


/*******************************
        Video Overrides
*******************************/



/*******************************
         Site Overrides
*******************************/