i followed the instruction, screen shot as below, anything i am missing here?

From official CodeMirror plugin usage tab:
CodeMirror themes are available in the official GitHub repository
More themes can be found at code-mirror-themes/themes at master · FarhadG/code-mirror-themes · GitHub and previewed here
To add a theme to your wiki, follow these four steps:
Hi Mohammad, thanks for helping again, i did exactly as what instruction said, post screen shot above , just don’t know why it doesn’t work!
I tested on TiddlyWiki Pre-release — 5.3.7-prerelease and it works.
Give a try and see how it works on https://tiddlywiki.com/prerelease
i tried 5.3.7 prerelease, still gives me same result.
this time i tried amy, it did change the background, but no color highlights .
i think the theme did work, just partly , don’t know the reason.
below screen shot of my tiddlywiki
below is the demo from Code Mirror
i found the problem. i only installed the first plugin. don’t know you will need to install all the addons to make it work…
just find out there is a plugin called “codemirror 6” , solved all the problem…