* {box-sizing: border-box;}

.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;
    vertical-align:middle;
}

.img-comp-slider {
    position: absolute;
    z-index: 9;
    cursor: ew-resize;
    /*set the appearance of the slider:*/
    width: 40px;
    height: 40px;
    opacity: 0.70;
    border-radius: 50%;
    background: #343754 url("../img/cd-arrows.svg") no-repeat center center;
    box-shadow: 0 0 0 6px rgba(0, 0, 0, 0.2), 0 0 10px rgba(0, 0, 0, 0.6), inset 0 1px 0 rgba(255, 255, 255, 0.3);
}