body,
html,
#app {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
  overflow: hidden;
  margin: 0px;
  position: relative;
  touch-action: none;
  /* background: linear-gradient(180deg, #fff -10%, #d0eeff 110%); */
  background-color: #000;
}
canvas {
  border: 4px solid #fff;
  box-sizing: border-box;
  margin: auto;
}