body{background-color:#f8f9fa;font-family:Arial,sans-serif;margin:0;padding:0}.button{background-color:#007bff;border:none;border-radius:4px;color:#fff;cursor:pointer;margin:10px;padding:10px 20px}.button a{color:#fff;text-decoration:none}.center{flex-direction:column;height:100dvh}.center,.row{align-items:center;display:flex;justify-content:center}.row{flex-direction:row}