.banner .banner-item {
    height: 258px;
}

.banner .banner-item {
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center center;
    color: #fff;
    position: relative;
}

    .banner .banner-item:before {
        position: absolute;
        height: 100%;
        width: 100%;
        background-color: rgba(0,0,0,0.6);
        content: "";
    }