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

header {
    background-color: #333;
    color: #fff;
    padding: 1em 0;
    text-align: center;
}

header h1 {
    margin: 0;
}

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

nav ul li {
    display: inline;
    margin: 0 10px;
}

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

main {
    padding: 20px;
    margin: 20px;
    background-color: #fff;
}

footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 10px 0;
    position: fixed;
    bottom: 0;
    width: 100%;
}

.products {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
}

.product {
    background-color: #fff;
    border: 1px solid #ddd;
    border-radius: 4px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    margin: 10px;
    padding: 20px;
    text-align: center;
    width: calc(25% - 40px);
    box-sizing: border-box;
}

.product img {
    max-width: 100%;
    border-bottom: 1px solid #ddd;
    margin-bottom: 10px;
}

.product h3 {
    margin: 10px 0;
}

.product p {
    font-size: 1.2em;
    color: #333;
}

.product button {
    background-color: #5cb85c;
    border: none;
    color: #fff;
    padding: 10px 20px;
    cursor: pointer;
    border-radius: 4px;
}

.product button:hover {
    background-color: #4cae4c;
}