.rtio-grafik {
    margin: 25px 0;
    padding: 15px;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}
.rtio-grafik h3 {
    text-align: center;
    margin-bottom: 15px;
    color: #333;
}
canvas {
    max-width: 100%;
    height: auto !important;
}