body {
    font-family: Arial, sans-serif;
    padding: 20px;
    background: #f8f8f8;
}

h1 {
    text-align: center;
    margin-bottom: 30px;
}

.filters {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-bottom: 20px;
}

select {
    padding: 5px;
    font-size: 14px;
}

.chart-container {
    width: 80%;
    margin: 0 auto;
    background: white;
    padding: 20px;
    border-radius: 8px;
}