body {
    max-width: 1000px;
    margin: auto;
    background-color: #f9f9f9;
}

header {
    background-color: #333;
    color: #fff;
    padding: 10px 0;
}

nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
}

nav ul li {
    margin: 0 15px;
}

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

.main {
    display: flex;
    border-radius: 5px;
    margin-top: 20px;
    background: white;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);

    .goods-display {
        width: 400px;
        height: 400px;
        display: flex;
        justify-content: center;
        align-items: center;

        .goods-img {
            border: 1px black solid;
            border-radius: 10px;
        }
    }

    .goods-info {
        height: 400px;

        .purchase-button {
            display: flex;
            justify-content: center;
            align-items: center;
            border-radius: 5px;
            background: #ed3029;
            color: white;
            width: 80px;
            height: 40px;
        }
    }
}

.goods-detail-info {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: white;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    border-radius: 5px;
    margin-top: 100px;
}