body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: url('3.jpg') no-repeat center center fixed;
    background-size: cover;
    color: #333;
}

.sidebar {
    height: 100%;
    width: 200px;
    position: fixed;
    top: 0;
    left: 0;
    background-color: rgba(255, 255, 255, 0.85);
    padding-top: 20px;
}

.sidebar a {
    display: block;
    padding: 10px;
    text-decoration: none;
    color: #333;
    font-weight: bold;
}

.sidebar a:hover {
    background-color: #ddd;
}

.logo {
    display: block;
    margin: 0 auto 20px;
    max-width: 150px;
}

.content {
    margin-left: 220px;
    padding: 20px;
    background-color: rgba(255,255,255,0.8);
}
table {
    border-collapse: collapse;
    width: 100%;
    margin-top: 20px;
}
th, td {
    border: 1px solid #999;
    padding: 8px;
    text-align: center;
}
th {
    background-color: #f2f2f2;
}