body {font-family: Arial, sans-serif;margin:0;padding:0;}
header {background:#004080;color:white;padding:1em;text-align:center;}
nav a {color:white;margin:0 10px;text-decoration:none;}
.hero {padding:2em;text-align:center;background:#f4f4f4;}
footer {text-align:center;padding:1em;background:#222;color:white;margin-top:2em;}
@media (max-width:600px){nav a{display:block;margin:5px 0;}}