I would like to change the color of the font color for the button icons.
I tried the following with sass:
trix-toolbar
.trix-button
background-color: $purple-dark-2
color: $white
It changes only the backgrond color like so:
I only found different fiddles on how to add new buttons in the toolbar. These two looked the most promising to me:
I found out that they use material icons and one can replace them: https://github.com/basecamp/trix/issues/464
Something like this regarding your paths will work as well:
trix-toolbar
.trix-button--icon-bold::before
background-image: url('../images/icon/baseline_format_bold_white_24dp.png')
the snippet is in sass you can convert to css or scss and even use .svg files.