.overlay {
    background: rgba(0, 0, 0, 0.5);
    height: 100%;
    left: 0;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1100;
}

.overlay-content {
    color: white;
    font-size: 2em;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translateX(-50%) translateY(-50%);
}