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

header {
    background-color: #4CAF50; 
    color: white;
    padding: 1em 0;
    text-align: center;
    border-bottom: 3px solid black; 
}


nav ul {
    list-style-type: none;
    padding: 0;
    text-align: center;
    background-color: #333;
}

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

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

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

main img {
    max-width: 100%;
    height: auto;
    margin-top: 20px;
}

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

.purchase-info img {
    border: black solid 3px;
    width: 600px;
    height: 400px;
    object-fit: cover;
    border-radius: 10px;
    margin-bottom: 10px;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

.purchase-form {
    border: 2px solid black;
    border-radius: 10px;
    padding: 20px;
    margin: 20px auto;
    width: 80%;
    max-width: 600px;
    background-color: #ffffff;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.go-back-button {
    position: absolute;
    top: 20px;
    left: 20px;
    background-color: darkblue;
    color: white;
    text-decoration: none;
    padding: 10px 20px;
    font-size: 1em;
    border-radius: 5px;
    border: none;
    cursor: pointer;
    text-align: center;
    transition: background-color 0.3s ease;
}

.go-back-button:hover {
    background-color: green;
} 

.go-back-button:hover {
    background-color: green;
}