.backdrop {position: fixed;top: 0;left: 0;width: 100%;height: 100%;background: rgba(0, 0, 0, 0.75);border: 0;opacity: 0;visibility: hidden; } .backdrop.animated {transition-duration: 0.15s;transition-property: opacity, visibility; } .backdrop.show {opacity: 1;visibility: visible; } .backdrop.backdrop-nav {z-index: 8000; } @media (min-width: 992px) {.backdrop.backdrop-nav.show {display: none;} } .backdrop.backdrop-modal {z-index: 100000; }