*,:before,:after{box-sizing:border-box}body{color:#fff;background:#000;margin:0;font-family:sans-serif}.app{box-sizing:border-box;flex-direction:column;align-items:center;gap:1rem;height:100vh;padding:1rem;display:flex}.streams{flex:1;gap:1rem;width:100%;display:flex}.streams video{object-fit:cover;background:#111;border-radius:8px;flex:1}.error{color:red;margin:0}button{cursor:pointer;padding:.5rem 2rem;font-size:1rem}button:disabled{opacity:.5;cursor:default}