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

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 10px 20px 20px 20px;
    text-align: center;
}

.container h2 {
    margin: 5px 0 10px 0;
    color: #333;
    font-size: 1.3rem;
}

.chart-wrapper {
    position: relative;
    width: 100%;
    max-width: 880px;
    margin: 0 auto;
}

canvas {
    width: 100% !important;
    max-width: 880px;
}

.roi-text {
    margin-top: 12px;
    font-size: 0.95rem;
    color: #444;
    line-height: 1.5;
}

.roi-text strong {
    color: #c62828;
}