body { font-family: Arial, sans-serif; margin: 0; padding: 20px; }
header { background: #007bff; color: white; padding: 15px; text-align: center; }
nav a { color: white; margin: 10px; text-decoration: none; }
main { padding: 20px; }
table { width: 100%; border-collapse: collapse; }
table, th, td { border: 1px solid black; padding: 10px; }
button { padding: 10px; background: #007bff; color: white; border: none; }