body {
  width: 200vw;
  height: 200vh;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  background-size: 75% 75%;
  background-attachment: fixed;
  background-repeat: no-repeat;
  z-index:2;
}

body:nth-of-type(1) {
  background-image: url('https://nicool.neocities.org/Images/bg.jpeg');
}