.slider-before-after {
    position: relative;
  /*overflow: hidden;*/
}
 
.slider-before-after img {
    width: 100%;
    display: block;
}
.slider-before-after__old {
  padding: 19px;
  border: 1px dashed gray;
}
.slider-before-after__new {
  border: 20px solid black;
}
 
.resize {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 50%;
    overflow: hidden;
}


.slider-before-after__handle { /* Thin line seperator */
  position:absolute; 
  left:50%;
  top:0;
  bottom:0;
  width: 0;
  /*width:4px;
  margin-left:-2px;
  background: rgba(0,0,0,.5);*/
  cursor: ew-resize;
}
 
.slider-before-after__handle:after {  /* Big orange knob  */
    content:'';
    display: block;
    position: absolute;
    top: 50%;
    width: 62px;
    height: 62px;
    margin: -31px 0 0 -31px;
    background: url(../img/slider-runner.png) no-repeat left top;
    z-index: 15;
}
.slider-before-after__handle:before {
    content:'';
    display: block;
    position: absolute;
    bottom: 0;
    right: -67px;
    width: 67px;
    height: 100%;
    background: url(../img/shadow-from-the-right.png) no-repeat left bottom; 
    background-size: auto 100%;
    opacity: 0.5;
}

.slider-before-after__handle--draggable:after {
    margin: -24px 0 0 -31px;
}