body { font-family: Arial, sans-serif; background:#f4f4f4; }
header, footer { background:#333; color:white; padding:10px; text-align:center; }
nav a { color:white; margin:0 10px; }
main { padding:20px; }
form, table { background:white; padding:15px; border-radius:5px; }
table { width:100%; border-collapse:collapse; }
th, td { border:1px solid #ccc; padding:8px; text-align:center; }