body { font-family: Arial, sans-serif; margin:0; padding:0; }
header { display:flex; align-items:center; justify-content:space-between; background:#0d6efd; padding:10px; color:#fff; }
nav a { color:#fff; margin:0 10px; text-decoration:none; }
.logo { height:40px; }
main { padding:20px; }