DESINCRUSTANTE X 1 litro. ba container { position: relative; width: 100%; max width: 700px; overflow: hidden; cursor: ew resize; } . ba img { width: 100%; display: block; user select: none; pointer events: none; } . ba overlay { position: absolute; top: 0; left: 0; width: 50%; height: 100%; overflow: hidden; } . ba slider { position: absolute; top: 0; left: 50%; width: 3px; height: 100%; background: #fff; z index: 3; } . ba slider:: before { content: ''; position: absolute;