.img-compare {
  position: relative;
  max-width: 600px;
  width: 100%;
  overflow: hidden;
  user-select: none;
}

.img-compare img {
  display: block;
  width: 100%;
}

.img-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 50%; /* start halfway */
  height: 100%;
  overflow: hidden;
}

.img-overlay img {
  display: block;
  width: 100%;
}

.slider-handle {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 100%;
  background-color: #fff;
  border: 1px solid #000;
  cursor: ew-resize;
  z-index: 10;
}