button{background-color:#2ecc71;color:#fff;border:none;padding:10px 20px;font-size:16px;cursor:pointer;border-radius:4px}button:hover{background-color:#28b463}#result{font-weight:700;margin-top:20px;color:#2ecc71;font-size:35px;text-align:center}canvas{margin-top:20px;border-radius:4px}