body {
    display: flex;
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
}

.sidebar {
    width: 100px;
    background-color: #f4f4f4;
    padding: 20px;
    height: 100vh;
    position: fixed;
    left: 0;
    top: 0;
}

.sidebar h2 {
    margin-top: 0;
}

.sidebar ul {
    list-style-type: none;
    padding: 0;
}

.sidebar li {
    margin-bottom: 10px;
}

.sidebar a {
    text-decoration: none;
    color: #333;
}

.sidebar a:hover {
    color: #007BFF;
}

.content {
    margin-left: 220px;
    padding: 20px;
    width: calc(100% - 220px);
}

.container {
    width: 100%;
    margin: auto;
    text-align: center;
}

.image-container {
    display: flex;
    justify-content: space-around;
    margin-top: 20px;
    flex-wrap: wrap;
}

.image-container div {
    flex: 1 1 45%;
    margin: 10px;
}

.image-container img {
    max-width: 100%;
    max-height: 600px;
    border: 1px solid #ddd;
    padding: 5px;
    display: block;
    margin: auto;
}

form {
    margin-top: 20px;
}

input[type="number"] {
    width: 60px;
    padding: 5px;
}

button {
    padding: 10px 15px;
    margin: 5px;
    cursor: pointer;
}

#error-message {
    color: red;
    margin-top: 10px;
}