body { font-family: sans-serif; max-width: 600px; margin: 2rem auto; }
input, button { display: block; margin: 0.5rem 0; }
ul { list-style-type: none; padding:0;}
li { margin: 0.5rem 0; background: #f0f0f0; padding: 0.5rem; border-radius: 4px;}