.img-comp-container {
    position: relative;
    height: 200px; /*should be the same height as the images*/
}

.img-comp-img {
    position: absolute;
    width: auto;
    height: auto;
    overflow: hidden;
}

    .img-comp-img img {
        display: block;
        /*max-width: 100%;*/
        vertical-align: middle;
    }

    .img-comp-img:not(.img-comp-overlay) img {
        width: 100%;
        height: auto;
    }

.img-comp-slider {
    position: absolute;
    z-index: 9;
    cursor: ew-resize;
    /*set the appearance of the slider:*/
    width: 40px;
    height: 40px;
    background-color: #2196F3;
    opacity: 0.7;
    border-radius: 50%;
}

.img-comp-container .img-comp-description {
    height: 22px;
}

    .img-comp-container .img-comp-description span:first-child {
        float: left;
    }

    .img-comp-container .img-comp-description span:last-child {
        float: right;
    }