body{margin:0;padding:0;background-color:#000;color:#fff;font-family:Arial,sans-serif}a{color:#00bcd4;text-decoration:none}a:hover{text-decoration:underline}.container{max-width:900px;margin:0 auto;padding:2rem}button{background-color:#00bcd4;color:#000;border:none;padding:.6rem 1.2rem;font-weight:700;cursor:pointer;border-radius:5px}button:hover{background-color:#0097a7}