.banner {
    background-size: cover;
    background-position: center;
    height: 500px;
    position: relative;
}
.banner-overlay {
    background: rgba(0, 0, 0, 0.5);
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: white;
}