body {font-family: Arial; margin:0; line-height:1.6;}
header {background:#0a192f; color:white; padding:20px; text-align:center;}
nav a {color:white; margin:0 15px; text-decoration:none;}
section {padding:40px; max-width:1000px; margin:auto;}
.btn {background:#0077ff; color:white; padding:10px 20px; text-decoration:none;}
footer {background:#0a192f; color:white; text-align:center; padding:20px;}