column pinning have some styling bugs

I’m submitting a … (check one with “x”)

[x ] bug report => search github for a similar issue or PR before submitting
[ ] feature request
[ ] support request => Please do not submit support request here

Current behavior Showing your example for column pinning here http://swimlane.github.io/ngx-datatable/# in my opinion there is a style problem. The divider between City and State Header is not horizontal aligned with the divider in the rows.

Expected behavior I think the divider should be aligned.

Reproduction of the problem See the example in our demo page

[jkon]

Similar issue I am seeing is that when using bootstrap or dark theme, pinned columns don’t hide scrolled columns beneath like material theme does. You can see the issue by changing the theme on the pinning demo (http://swimlane.github.io/ngx-datatable/#pinning) using the dev console. If you change it to bootstrap, the middle columns scroll horizontally and you can still see them under the frozen columns

Also, the material striped theme loses the striping on the frozen columns:

[DSplawski92]

Similar issue I am seeing is that when using bootstrap or dark theme, pinned columns don’t hide scrolled columns beneath like material theme does. You can see the issue by changing the theme on the pinning demo (http://swimlane.github.io/ngx-datatable/#pinning) using the dev console. If you change it to bootstrap, the middle columns scroll horizontally and you can still see them under the frozen columns

It seems issue still occurs. Is there any solution based on CSS?