html,body{background:#000;justify-content:center;align-items:center;width:100%;height:100%;margin:0;font-family:Arial,sans-serif;display:flex;overflow:hidden}.app{gap:16px;padding:16px;display:flex}.controls{flex-direction:column;gap:8px;width:220px;display:flex}input,select,button{padding:6px;font-size:14px}button{cursor:pointer}.list{background:#fff;border:1px solid #ddd;min-height:40px;margin-top:8px;padding:6px;font-size:12px}canvas{background:0 0;border:1px solid #ccc}