Preview:
/* #navbar is the topmost element and <main> contains all other content */

#navbar {
  /* CSS property ensuring #navbar always stays in the same place even if the page is scrolled: */
  position: fixed;
}

main {
  /* Ensure the remaining content doesn't hide behind the #navbar: */
  position: absolute;
  z-index: 1;
  top: 100px;
}
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