video{
  width: 100%;
  height: 100%;
}
#btn {
  position: absolute;
  bottom: 0px;
  right: 0px;
  z-index: 100;
}
#btn img {
  height: 2em;
  margin: 5px;
}
#txt {
  position: absolute;
  bottom: 0px;
  left: 0px;
  z-index: 100;
  color: red;
  margin-bottom: 5px;
  margin-left: 20px;
  line-height: 2em;
  font-family: 'Roboto', sans-serif;
}