body::before { content: ""; position: fixed; left: 0; right: 0;  top: 72px; bottom: 0; z-index: 80; background: rgba(15, 23, 20, 0.35); opacity: 0; visibility: hidden; pointer-events: none; transition: opacity 0.25s ease, visibility 0.25s ease; } body:has(header [aria-expanded="true"])::before { opacity: 1; visibility: visible; }  header, .brxe-header, #brx-header { position: relative; z-index: 200; background: #fff; }  .mega-menu-offer-div { position: relative; z-index: 300; }