* {
  margin: 20px;
  padding: 0;
  box-sizing: border-box;
}
body {
  margin: 0;
  padding: 0;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  background: "white";
}
canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 90vw !important;
  height: 90vh !important;
}