<style>
  body{
    /* Fixed, repeating background */
    background: url('https://www.dazzlejunction.net/backgrounds/plaid/dark-blue.jpg') repeat fixed;
    /* Optional:
    background-size: auto;   
    min-height: 100vh;       
  } </style> <a href="https://www.dazzlejunction.net/backgrounds/plaid/">Plaid Backgrounds</a>