html, body { height: 100% }

body {
  display: flex;
  align-items: center;
  background-color: #000000;
}

.container {
  max-width: 500px;
  margin: 0 auto;
  padding: 50px;
  background-color: #fff;
  box-shadow: 0 0 24px 0 rgba(0, 0, 0, 0.06), 0 1px 0 0 rgba(0, 0, 0, 0.02);
}

canvas.background {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: -1;
}