#video-box { width: 100% }

.youtube-player {position: relative;
  padding-bottom: 55.25%;
  height: 0;
  overflow: hidden;
  max-width: 100%;
  background: #000;
  margin: 5px;
}

.youtube-player iframe {position: absolute; z-index: 100;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: transparent;
}

.youtube-player img {position: absolute; display: block; object-fit: fill;
  left: 0;
  bottom: 0;
  margin: auto;
  max-width: 100%;
  width: 100%;
  right: 0;
  top: 0;
  border: none;
  height: auto;
  cursor: pointer;
  -webkit-transition: 0.4s all;
  -moz-transition: 0.4s all;
  transition: 0.4s all;
}

.youtube-player img:hover {
  -webkit-filter: brightness(75%);
  -moz-filter: brightness(75%);
  filter: brightness(75%);
}

.youtube-player .play {position: absolute; background: url("../images/play.png") no-repeat;
  height: 72px;
  width: 72px;
  left: 50%;
  top: 50%;
  margin-left: -36px;
  margin-top: -36px;
  cursor: pointer;
}