The solution from @GreenJimll is working fine although the forward text area and the new ticket creation text area suffer from the same issue.
To solve this issue :
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Create the local directory “mkdir -p /opt/rt5/local/static/RichText/skins/bootstrapck/”
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Copy each browsers file
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For Chrome “cp /opt/rt5/share/static/RichText/skins/bootstrapck/editor.css /opt/rt5/local/static/RichText/skins/bootstrapck/”
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For Firefox “cp /opt/rt5/share/static/RichText/skins/bootstrapck/editor_gecho.css /opt/rt5/local/static/RichText/skins/bootstrapck/”
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Edit all of the files above and add the line below
- .darkmode #cke_Content .cke_contents .cke_wysiwyg_frame{background-color: #fff !important;}
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Save changes, delete mason cache, restart Apache, delete your browser’s local cache
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Done
I also filled a bug report https://rt.bestpractical.com/Ticket/Display.html?id=36828