body {
  margin: 0;
  background: black;
  color: white;
  font-family: Verdana;
  text-align: center;
}

/* background image */
.bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* center button */
#enterBtn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  padding: 20px 40px;
  font-size: 24px;
  background: black;
  color: white;
  border: 2px solid white;
  cursor: pointer;
}

#enterBtn:hover {
  background: white;
  color: black;
}