**assets/css/style.css** – Estilo básico:
```css
body {
    font-family: Arial, sans-serif;
    margin: 20px;
    background-color: #f0f0f0;
}
h1, h2 {
    color: #333;
}
header nav a {
    margin-right: 10px;
    text-decoration: none;
    color: #007BFF;
}
table {
    width: 100%;
    border-collapse: collapse;
    background-color: #fff;
}
th, td {
    padding: 8px;
    border: 1px solid #ccc;
    text-align: left;
}