html{font-family:sans-serif;background-color:#fff}body{margin:0;min-width:300px}.container{max-width:1000px;margin:auto}.exercise{margin:20px 0;background-color:#fff;display:flex;flex-direction:column;justify-content:center}.button{-webkit-appearance:none;padding:8px 18px}.image{max-height:80vh;width:auto;object-fit:contain}.image:focus{outline:2px solid blue}@keyframes spin{0%{transform:rotate(0deg)}to{transform:rotate(1turn)}}