UX Improvement - Highlight Colours

[Sam-Jayes]

Issue type: UX Improvement

Issue Description:

When selecting/clicking on a group (capture or non capture group) the highlight colour doesnt stand out.

3 images attached: (capture group labelled "Example")

• No capture group selected

• Example Capture group selected (dark colour, not clear)

Suggested Improvement:

Change background colour to a bright colour when group is selected (for both dark and light mode)

• Screenshot of how the colour change makes it clearer. Bright Pipes and capture group stands out making it easier to see different sections of the regex