html, body {
  width: 100%;
  height:100%;
}

.biliegg {
  background: url(https://bili.neocities.org/biliegg.png) repeat 0 0;
  width: 100%;
  margin: 0;
  text-align: center;
  height: 100%;
  box-sizing: border-box;
  -webkit-animation: slide 20s linear infinite;
}


@-webkit-keyframes slide {
    from { background-position: 0 0; }
    to { background-position: -400px 0; }
}