body{font-family:sans-serif;background-color:#fff}header{background-color:#000;color:#fff;padding:20px}h1{font-size:2em}main{padding:20px}section{margin-bottom:20px}.hero{background-color:#fff;padding:20px}.hero img{max-width:100%}.features{background-color:#f9f9f9}.call-to-action{background-color:#000;color:#fff;padding:20px}a{text-decoration:none;color:#fff}a:hover{color:#000}