.youtube { /* continer (responsive) */
  position: relative;
  cursor: pointer;
  background: #ccc no-repeat center center / cover; 
  padding-bottom: 56.25%; /* 16:9 */
  height: 0px;
  clear:both;
}

.youtube::before { /* play bubble */
  content: '';
  background: rgba(255, 255, 255, .6);
  height: 80px;
  width: 80px;
  display:block;
  margin: -40px 0 0 -40px;
  border-radius: 100px;
  position: absolute;
  top: 50%;
  left: 50%;
  box-shadow: 0 0 20px 3px rgba(51, 51, 51, .8);
  transition: all .1s ease;
  z-index:1;
}

.youtube:hover::before { /* play bubble hover */
  background: rgba(238, 238, 238, .8);
  box-shadow: 0 0 10px 3px rgba(51, 51, 51, .8);
  width: 100px;
  height: 100px;
  margin: -50px 0 0 -50px;
}

.youtube::after { /* Play Triangle */
  content: '';
  width: 0;
  height: 0;
  line-height:0px;
  display:block;
  border-style: solid;
  border-width: 20px 0 20px 40px;
  margin: -20px 0 0 -15px;
  border-color: transparent transparent transparent #333;
  position: absolute;
  top: 50%;
  left: 50%;
  height: 0;
  width: 0;
  z-index:2;
} 
.youtube iframe{ /* youtube embed (responsive) */
  width:100%;
  height:100%;
  position:absolute;
  top:0;
  left:0;
  z-index:3;
}
/* END Fast & Agile YouTube Embed by Schoberg.net */