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In addition to the recommendations above, you may also want to think about changing the colour of the following items:
The following options will ensure that the chart title and sub title are displayed correctly and can be found on Dashboard Configuration>Themes>Chart Panel:
.pi-style__chart-panel__chart-title and
.pi-style__chart-panel__chart-subtitle which you can find in Dashboard Configuration>Themes>Chart Panel - this
The following options will ensure that the colour of your chart titles and subtitles are displayed correctly in the dashboard.X & Y axis and the Legend are displayed correctly and can be found on Dashboard Configuration>Themes>Chart:
.pi-style__chart__x-axis-title
.pi-style__chart__x-axis-value
.pi-style__chart__y-axis-title
.pi-style__chart__y-axis-value
.pi-style__chart__legend-title
.pi-style__chart__legend-value
Dark themes and Speedometers
When using a dark theme, the label in the centre of a Speedometer will be transparent. This allows for light colours to be used for the label text.
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Dark Themes and Data Tables
When using Data Tables, changing the colour of the following CSS tags will ensure that your header and body rows are displayed correctly. You can find these options on Dashboard Configuration>Themes>Table.
.pi-style__table-header-cell
.pi-style__table-body-cell