<style>
  body{
    /* Fixed, repeating background */
    background: url('https://commenthaven.dazzlejunction.net/layouts/skull/skulls-black.gif') repeat fixed;
    /* Optional:
    background-size: auto;   /* keep natural tile size */
    min-height: 100vh;       /* ensure full viewport height */
  }
</style>

<a href="https://commenthaven.dazzlejunction.net/layouts/skull/">Skull Backgrounds</a>