/* 保留在线字体作为备选 */
@import url("https://fonts.googleapis.com/css2?family=Roboto&display=swap");

body, html {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #001;
}

canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}