body{margin:0;font-family:Lato,sans-serif;background-color:#fafafa;color:#333}h1,h2,h3,h4{margin-top:.5em;margin-bottom:.5em}p{margin-bottom:1em;line-height:1.6}.btn{background-color:#4caf50;color:#fff;padding:.8rem 1.2rem;text-decoration:none;border-radius:4px;font-weight:600;transition:background .3s ease;display:inline-block}.btn:hover{background-color:#45a049}