html,
body {
  height: 100%;
  min-width: 560px;
}

div.container {
  height: 100%;
}

.txt80 {
  font-size: 0.8em;
}

.copylight {
  font-size: 0.7em;
  line-height: 1.2em;
}

.return {
  font-size: 0.75em;
  line-height: 2em;
}

.back {
  width: 100%;
  margin: 20px 0px 0px 0px;
  font-size: 0.8em;
  text-align: center;
}

.yt_movie_outer {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 100%;
}

.yt_movie {
  margin: 0px auto;
  position: relative;
  padding-bottom: 56.25%;
  padding-top: 30px;
  height: 0;
  overflow: hidden;
}

.yt_movie iframe {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  margin: auto;
  width: 100%;
  height: 100%;
}