body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}

header {
    background-color: #4CAF50;
    color: white;
    padding: 10px 0;
    text-align: center;
}

nav ul {
    list-style: none;
    padding: 0;
}

nav ul li {
    display: inline;
    margin: 0 15px;
}

nav ul li a {
    color: white;
    text-decoration: none;
    font-weight: bold;
}

main {
    padding: 20px;
    text-align: center;
}

.content-grid {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.category {
    background: white;
    padding: 10px;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    max-width: 300px;
    text-align: center;
}

.category img {
    max-width: 100%;
    border-radius: 5px;
}

footer {
    background-color: #4CAF50;
    color: white;
    text-align: center;
    padding: 10px;
    position: absolute;
    bottom: 0;
    width: 100%;
}