body {
  margin: 0;
  background-color: black;
  color: white;
  font-family: Arial, sans-serif;
  text-align: center;
}

video {
  width: 100%;
  height: auto;
  display: block;
}

#menu {
  position: absolute;
  top: 40%;
  left: 50%;
  transform: translate(-50%, -50%);
}

button {
  padding: 15px 30px;
  font-size: 20px;
  cursor: pointer;
}