:root {
  --background-color-light: #1b2735;
  --background-color-dark: #090a0f;
}

html {
  height: 100%;
  overflow: hidden;
  background: radial-gradient(
    ellipse,
    var(--background-color-light) 0%,
    var(--background-color-dark) 100%
  );
}

canvas {
  position: absolute;
}