/* make canvas cover the viewport, behind everything */
body, html {
  margin: 0;
  padding: 0;
  height: 100%;
  overflow: hidden;
}
canvas#meteors {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: #000022; /* dark-night sky */
  z-index: -1;          /* sit behind page content */
}
.hero {
  position: relative;
  z-index: 1;
  /* any extra spacing / typography here */
}