body{font-family:Arial;background:#0a1a3f;color:white;margin:0;}
header{padding:10px;text-align:center;background:#0d245c;}
nav{background:#122b66;padding:10px;text-align:center;}
nav a{color:white;margin:0 15px;text-decoration:none;font-weight:bold;}
section{padding:20px;}