.crop-wrap { position: relative; display: inline-block; touch-action: none; } .crop-wrap canvas { display: block; max-width: 100%; max-height: 480px; } #box { position: absolute; border: 2px solid #fff; box-shadow: 0 0 0 9999px rgba(0,0,0,.5); cursor: move; } #box i { position: absolute; right: -10px; bottom: -10px; width: 20px; height: 20px; background: #fff; border-radius: 50%; cursor: nwse-resize; }