@media (max-width: 767px) {
  header,
  .navbar-sticky,
  .navbar-fixed {
    position: fixed !important;
    top: 0;
    width: 100%;
    z-index: 9999;
    background-color: #fff;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1); /* optional for visibility */
  }

  body {
    padding-top: 70px; /* Adjust if your header is taller or shorter */
  }
}