body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #DEBFC0;
    color: #333;
}

.header {
    background-color: #B56E6D;
    color: #fff;
    padding: 20px;
    text-align: center;
}

.container {
    display: flex;
}

.sidebar {
    background-color: #fff;
    padding: 20px;
    width: 300px;
    box-shadow: 2px 0 5px rgba(0, 0, 0, 0.1);
}

.sidebar h2 {
    color: #B56E6D;
}

.viewer {
    flex-grow: 1;
    background-color: #f9f9f9;
    display: flex;
    align-items: center;
    justify-content: center;
}

#preview {
    width: 80%;
    height: 80%;
    background-color: #fff;
    border: 1px solid #ddd;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}