* {
  padding: 0;
  margin: 0;
}
body {
  background-color: #000;
  overflow: hidden;
}
#main {
  margin: 0;
  background-color: #000;
  text-align: center;
  background-image: url('../img/body.png');
  background-repeat: no-repeat;
  background-size: cover;
  padding-top: 42px;
  width: 375px;
}

#video {
  display: block;
  width: 100%;
  height: 478px;
  z-index: 1003;
}

#btn {
  width: 100%;
  height: 300px;
  position: fixed;
  bottom: 0px;
}