canvas{display:block}#app{text-align:center;display:flex;justify-content:center}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Open Sans,serif;font-optical-sizing:auto}.btn-container{padding:1rem 0}.btn-container button{border:1px solid #333;padding:.5rem 1rem;background:#fff;cursor:pointer;border-radius:.5rem}button:disabled{cursor:not-allowed;opacity:.5}div[class$=-container]{padding:1rem;margin:1rem 0;border:1px solid #333;text-align:center}