Spreadsheet 5 css styles interfere grid css styles

Suite and Optimus
#1

If you have spreadsheet library on the same page with dhx grid the spreadsheet css styles for header override the grid styles and i noticed that the the horizontal custom scrollbar goes behind the columns when u have applied frozen columns for the grid.

Obviously the z-index is the issue here.

#2

Hello.

Could you please, provide a code snippet/complete demo/screenshots with the issue?
The following example seems to work well:
https://snippet.dhtmlx.com/bx3w9hgq