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

header {
    background: #222;
    color: white;
    padding: 15px;
    display: flex;
    justify-content: space-between;
}

.logo {
    margin-left: 20px;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 20px;
    margin-right: 20px;
}

nav ul li {
    cursor: pointer;
}

.page {
    display: none;
    padding: 20px;
}

.visible {
    display: block;
}

.product-grid {
    display: flex;
    gap: 20px;
}

.product {
    background: white;
    padding: 15px;
    width: 200px;
    border-radius: 5px;
}

button {
    margin-top: 5px;
    width: 100%;
    padding: 8px;
}

.form-box {
    background: white;
    padding: 15px;
    margin: 20px 0;
}