body {
    background: linear-gradient(135deg, #eef2f3, #dfe9f3);
    font-family: 'Segoe UI', sans-serif;
}

.card {
    border-radius: 20px;
}

#chart_div {
    width: 100%;
    height: 500px;
}

footer {
    position: relative;
    bottom: 0;
    width: 100%;
}