html {
  position: fixed;
  background-color: #350ab5;
}
body {
  position: fixed;
  left: 0px;
  right: 0px;
  top: 0px;
  bottom: 0px;
}
html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
}

#canvas {
  width: 100vw;
  height: 100vh;
  outline: none;
}