* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #000 url('assets/flag.gif') center center / cover no-repeat;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: 0;
}

canvas {
  display: block;
  position: relative;
  z-index: 1;
}