Different coloured cards for PR and issues

[NorbertLoh]

Is your feature request related to a problem? Please describe.
This is based on suggestions and discussions we had in class that would benefit the person implementing it.
Original discussion can be found here

Describe the solution you'd like
For example, if a card in the issue viewer is an issue, the background colour can be set to lightgrey (just an example, feel free to experiment with better colours). The field isIssue can be used to differentiate them.

[damithc]

Yup, we can try using a light background colour to differentiate. Light grey is probably not suitable though, as it can give the impression of disabled or dimmed out.