Ability to style insert, delete, modified codeMarker separately

[rishabhrathod01]

Ability to style insert, delete, modified codeMarker separately

Expected Behaviour

Solution (suggestion)

For my use case, I made this changes which helped me solve the issue.

Sample code to reproduce your issue

currently, it is only possible to use a single class to style all highlighted code.

.codeMarker {
background-color: '#123456';
}

If the above changes are helpful. ( with few modifications ) I would be more than happy to contribute a PR to resolve the issue.