#mList A {
  margin: 10px;
  width: 275px;
  height: 155px;
  line-height: 155px; /* match height */
  color: #FFF;
  font-weight: bold;
  text-align: center;
  text-decoration: none;
  border: 1px solid #000;
  display: inline-table;
}

#mPlayer {
  display: none;
  background: rgba(0, 0, 0, .8);
  position: fixed;
  width: 100%;
  height: 100%;
  z-index: 20;
  left: 0;
  top: 0;
}

#mPlayer DIV {
  position: fixed;
  background: #000;
  width: 560px; /* width of YouTube Player */
  height: 315px; /* height of YouTube Player */
  left: calc(50vw - 280px); /* 280 is .5(560), centers x axis*/
  top: calc(50vh - 157px); /* 157 is .5(315), centers y axis*/
}