body {
    margin: 0;
    font-family: Arial, sans-serif;
    background-color: #f0f0f0;
}

header {
    background-color: #4CAF50; /* verde */
    color: white;
    text-align: center;
    padding: 15px 0;
}

header h1 {
    margin: 0;
}

nav {
    background-color: #333;
    padding: 10px;
}

nav a {
    color: white;
    text-decoration: none;
    margin: 0 15px;
    font-weight: bold;
}

nav a:hover {
    text-decoration: underline;
}

main {
    background-color: white;
    margin: 20px;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 5px rgba(0,0,0,0.1);
}

footer {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 10px;
    margin-top: 20px;
}