:root{font-family:system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{margin:0;display:flex;place-items:center;min-width:320px;min-height:100vh}#root{max-width:1280px;margin:0 auto;padding:2rem;text-align:center}@keyframes btn-animation{0%{background-color:#00f;transform:scale(1)}25%{background-color:green;transform:scale(1.1)}50%{background-color:red;transform:scale(1)}75%{background-color:#ff0;transform:scale(1.1)}to{background-color:#00f;transform:scale(1)}}#cool-animation{animation:btn-animation 2s infinite}