Is there any way to use theme CSS from screen.css inside of CKEditor ?

[Connie]

your suggestion is not the correct solution for the problem, as this directive is read when the calling programme (GetSimple) instantiates / starts the Editor
so what when you switch a theme?

I found one working solution / workaround:

the default css-file for the editor is the file admin\template\js\ckeditor\contents.css

if you need a fast solution, you can copy the content of your css-file into that file and upload it to the defined destination

I tested with

Code:

body {
    color: #416a8b;
    font-family: Arial;
    font-size: 18px;
    font-weight: 400;
   text-align: left;
}

instead of the default-body-definition there and I got that blueish big letters in Arial as the default text-formatting

I tried to add a directive to the custom-config-file of CKEditor in GS (see the wiki), but to no avail until now

as I said, this is a fast workaround if you stick with one theme