.app{font-family:system-ui,sans-serif;max-width:24rem;margin:2rem auto;padding:1rem}.app__label{margin:0 0 1rem;font-size:1.25rem}.app__button{padding:.5rem 1rem;font-size:1rem;cursor:pointer}.app__button:disabled{opacity:.6;cursor:not-allowed}.app__error{margin-top:1rem;color:#b00020;font-size:.9rem}*,*:before,*:after{box-sizing:border-box}body{margin:0;min-height:100vh}