* {
    box-sizing: border-box;
}

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

.container {
    display: flex;
}

.sidebar {
    width: 25%;
    background-color: #f4f4f4;
    padding: 20px;
    border-right: 1px solid #ddd;
}

    .sidebar h2 {
        font-size: 20px;
        margin-bottom: 20px;
    }

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

        .sidebar ul li {
            margin: 10px 0;
        }

    .sidebar .dropdown {
        font-weight: bold;
        color: #007BFF;
        text-decoration: none;
    }

        .sidebar .dropdown:hover {
            text-decoration: underline;
        }

    .sidebar ul ul {
        list-style-type: none;
        padding-left: 20px;
        display: none;
    }

    .sidebar ul li:hover > ul {
        display: block;
    }

.main-content {
    width: 75%;
    padding: 20px;
}

    .main-content h2 {
        font-size: 24px;
    }

#table-area {
    margin-bottom: 20px;
    border: 1px solid #ddd;
    min-height: 200px;
    padding: 10px;
}

.actions {
    margin-top: 20px;
}

    .actions button {
        margin-right: 10px;
    }