body {
    margin: 0;
    font-family: 'Arial', sans-serif;
    background-color: #000;
    color: white;
    display: flex;
}
.sidebar {
    width: 240px;
    background-color: #111;
    padding: 20px;
}
.sidebar h2 {
    font-size: 18px;
    margin-bottom: 20px;
}
.sidebar ul {
    list-style-type: none;
    padding: 0;
}
.sidebar li {
    padding: 12px 0;
    border-bottom: 1px solid #333;
    cursor: pointer;
}
.main {
    flex: 1;
    padding: 20px;
}
.cards {
    display: flex;
    gap: 20px;
    margin: 20px 0;
}
.card {
    background-color: #222;
    padding: 20px;
    border-radius: 10px;
    width: 150px;
    text-align: center;
    font-size: 18px;
}
.chart {
    margin-top: 40px;
}