body { margin: 0; padding: 0; width: 100vw; height: 100vh; overflow: hidden; background-color: #000; } #output { z-index: 1; } #overlay { position: absolute; top: 0; left: 0; width: 100%; height: 100%; pointer-events: none; z-index: 1; opacity: 0.5; } #webcam { position: absolute; width: 100%; height: 100%; object-fit: cover; z-index: 0; }