Most of the color fields in our extensions allow you to define alpha channel. This is why most of the fields are 8 characters except the usual 6 characters.

If alpha is enabled for a color field, you will see a slider below the color choose:

In this example you can see, that the color of the font is white (#ffffff) and the opacity is around 50%, so the color are calculated by the mix of the green background and the white font color.