Oh, that’s a custom plugin for TinyMCE. I changed its color by putting this code .mce-i-template:before{color:#ff0000;} to the \modules\steasycontent\views\css\admin.css filed.
Hello, I’m sorry, I did not explain myself as well as I thought. I’m looking for the css where the buttons are: btn btn-small, btn btn-medium,… Think’s for your reply
I knew there must be a misunderstanding. Do you want to change the colors of buttons in a custom content block? Scroll the editing page of the “Custom content block” module down to find options to do that, see attached picture.