body { margin: 0; font-family: Arial, sans-serif; background-color: #f0f8ff; }
header { background-color: #003366; color: white; padding: 20px; text-align: center; }
nav a { color: white; margin: 0 10px; text-decoration: none; }
main { padding: 20px; }
footer { background-color: #003366; color: white; text-align: center; padding: 10px; }
.btn-whatsapp { background-color: #66ccff; color: #003366; padding: 10px 20px; border-radius: 5px; text-decoration: none; }
ul { list-style-type: none; padding: 0; }
li { margin: 10px 0; }