:root{color:#e9edf2;background:#15191f;font-family:system-ui,sans-serif}body{margin:0}#app{width:min(90vw,760px);margin:2rem auto}h1{margin-bottom:.25rem;font-size:1.5rem}p{color:#9fa9b7;margin-top:0}#viewport{background:#222831;width:100%;height:min(65vh,480px)}#viewport canvas{display:block}button{margin-top:1rem;padding:.5rem .75rem}output{margin-left:1rem;display:inline-block}