The margin between the editor and the codemarker icon is too close so the pointer doesn't show up, tried fixing that.
Replaced the Codemarker icons with the unicode circled plus ⊕ and minus ⊖ ones, I think they feel a lot intuitive and replaced the fold marker icon with minimalistic three dots "..."
Replaced the colours of the icons with material orange instead of white/grey for those using a Brackets light theme.
Thanks for the PR. However this is a theming issue and not a core code-folding issue. I would suggest creating a PR on the repo for the theme you are currently using.
The margin between the editor and the codemarker icon is too close so the pointer doesn't show up, tried fixing that.
Replaced the Codemarker icons with the unicode circled plus ⊕ and minus ⊖ ones, I think they feel a lot intuitive and replaced the fold marker icon with minimalistic three dots "..."
Replaced the colours of the icons with material orange instead of white/grey for those using a Brackets light theme.