body {
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    font-family: Arial, sans-serif;
    background-color: #f0f0f0;
}

.outer-box {
    border: 2px solid #000;
    width: 80%;
    max-width: 1200px;
    min-width: 600px;
    height: 0;
    padding-bottom: 60%; /* Maintains aspect ratio (e.g., 4:3 or adjustable) */
    position: relative;
    background-color: #fff;
}

.inner-container {
    display: flex;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    padding: 2%;
}

.banner {
    height: 15%;
    text-align: center;
    border-bottom: 1px solid #000;
    padding: 10px;
    box-sizing: border-box;
}

.sidebar {
    width: 20%;
    border-right: 1px solid #000;
    padding: 10px;
    box-sizing: border-box;
}

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

.sidebar ul li {
    padding: 5px 0;
    cursor: pointer;
}

.sidebar ul li:hover {
    background-color: #e0e0e0;
}

.content {
    flex: 1;
    padding: 10px;
    box-sizing: border-box;
}

.version {
    position: absolute;
    bottom: 0;
    width: 100%;
    text-align: center;
    border-top: 1px solid #000;
    padding: 5px;
    box-sizing: border-box;
}