qt_demoe/qwtdemo/examples/stylesheets/rosy.css

QwtPlot
{
    border: 1px solid white;
    border-radius: 10px;
    padding: 10px;
    background-color: qlineargradient( x1: 0, y1: 0, x2: 0, y2: 1,
        stop: 0 #7e354d, stop: 0.5 #7f5a58, stop: 1 #7e354d );
}

QwtPlotCanvas
{
    border: 1px solid White;
    border-radius: 10px;
    background-color: #7f5a58;
}

QwtPlotGLCanvas
{
    border: 1px solid White;
    background-color: #7f5a58;
}

QwtScaleWidget
{
    color: white;
}

QwtTextLabel#QwtPlotTitle
{
    color: white;
}

QwtTextLabel#QwtPlotFooter
{
    color: white;
}

QwtLegend
{
    border: 1px solid white;
    border-radius: 10px;
    padding: 2px;
    background: #7f5a58;
}

QwtLegendLabel
{
    color: white;
}