body {
    font-family: Arial, sans-serif;
    margin: 20px;
}
.chart-container {
    width: 900px;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-around;
    margin: 0 auto;
}
.chart {
    width: 45%;
    min-width: 300px;
    margin-bottom: 40px;
}
.header-container {
    display: flex;
    align-items: center;
}
#fileInput {
    margin-bottom: 20px;
}