Name your theme with the Theme Name.
The Chart Theme dropdown allows you to choose the chart theme that will be applied to all chart blocks on your Portal. This is an easy way to ensure all your charts and graphs match the look and feel of your brand and the rest of the Portal. You can also override the settings from the chart theme in the configuration of an individual chart block.
In the Theme Settings, you can set site wide CSS variables.
For example, if you want to change the background color of every page, you would edit the
--body-bg-color CSS variable. If you plan to use a page template with a header and/or sidebar, adjust the height, width and background colors of these here.