#myVideo {
  position: fixed;
  right: 0;
  width: 100%;
  min-height: 100%;
}

.content{
  position: fixed;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  color: #f1f1f1;
  width: 100%;
  padding: 20px;
  background: contain;
}

#myBtn {
  width: 200px;
  font-size: 18px;
  padding: 10px;
  border: none;
  border-radius: 30px;
  background: rgb(0, 68, 255);
  color: #fff;
  cursor: pointer;
  margin-left: 40vw;
}

#myBtn:hover {
  background: #ddd;
  color: black;
}

@media only screen and (max-width:400px){
  #myBtn {
    margin-left: 20vw;
  }
}