html {
  height: 100%;
  overflow: hidden;
}

body {
  height: 100%;
  overflow-y: auto;
  background-image: url('https://cdn.deocdn.com/bg/2.png');
  background-repeat: no-repeat;
  background-attachment: scroll;
  background-color: #0d0d1a;
}

@media (max-width: 768px) {
  body {
    background-size: cover;
    background-position: center top;
  }
}

@media (min-width: 769px) {
  body {
    background-size: auto;
    background-position: top left;
  }
}