header {
    position: sticky;
    top: 0;
    z-index: 40; /* Ensures the header stays on top of other elements */
  }

  /* html, body { height: 100%; }
body { display: flex; min-height: 100vh; flex-direction: column; }
main { flex: 1 0 auto; } */
 header{
  z-index: -99;
 }