body{margin:0;padding:0;font-family:Arial,sans-serif;font-size:18px;line-height:1.5;background-color:#f0f0f0;color:#222}main{max-width:30rem;margin:0 auto;padding:1rem}h1{font-size:3rem;margin:0}p{color:#444}.vertical-stack{display:flex;flex-direction:column;gap:.25rem}