.slider-banners {
    position: relative;
    height: 240px;
    max-width: 100%;
    overflow: hidden;
    margin: 0 auto;
    text-align:center;
}
.slider-banner {
    position: absolute;
    top:0;
    left:0;
}
.slider-banners-wrapper {
    width:100%;
    height:100%;
}
.slider-banner {
    width:100%;
    height:100%;
}
.slider-banner-img {
    background-position: center center;
    background-size: cover;
    background-repeat: no-repeat;
    width:100%;
    height:100%;
}

@media screen and (min-width: 768px) {
    .slider-banners {
        height: 432px;
    }
}
@media screen and (min-width: 1024px) {
    .slider-banners {
        height: 578px;
    }
}
@media screen and (min-width: 1200px) {
    .slider-banners {
        height: 810px;
    }
}