body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}
header {
    background: #f8f8f8;
    padding: 20px;
    text-align: center;
}
h1 {
    color: #3c763d;
}
nav ul {
    list-style-type: none;
    padding: 0;
}
nav ul li {
    display: inline;
    margin: 0 10px;
}
.product-list {
    display: flex;
    justify-content: space-around;
}
.product-item {
    border: 1px solid #ccc;
    padding: 10px;
    margin: 10px;
    width: 30%;
}
footer {
    text-align: center;
    padding: 20px;
    background: #f8f8f8;
    position: relative;
    bottom: 0;
    width: 100%;
}
form {
    display: flex;
    flex-direction: column;
    max-width: 400px;
    margin: auto;
}