body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background: #f5f5f5;
    color: #333;
}
header {
    background: #003366;
    color: white;
    padding: 1em;
    text-align: center;
}
nav ul {
    list-style: none;
    background: #0055a5;
    padding: 0;
    display: flex;
    justify-content: center;
}
nav ul li {
    margin: 0 1em;
}
nav ul li a {
    color: white;
    text-decoration: none;
}
section {
    padding: 1em 2em;
    background: white;
    margin: 1em;
    border-radius: 5px;
}
footer {
    text-align: center;
    padding: 1em;
    background: #003366;
    color: white;
}
.whatsapp {
    display: block;
    background: #25d366;
    color: white;
    text-align: center;
    padding: 1em;
    text-decoration: none;
    font-weight: bold;
    border-radius: 5px;
    margin: 2em auto;
    width: fit-content;
}