How can I define my own colors in the W3.CSS design?
In W3.CSS forms the colors can be defined by preselection.

This results, for example, in a fixed background color:

The color can be overridden with CSS in the advanced form settings:

Example
In the example we overwrite the color for “w3-dark-grey”. We can set the foreground color and the background color.
<style type="text/css">
.w3-dark-grey {
color:#fff!important; background-color:#FF0000!important;
}
</style>
This ensures that the original color is overwritten. The new color is retained even if the export is repeated.
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