Hi,
Changes:
1) Display only border-top for data-grid header instead of border on whole data-grid.
2) Remove dotted border from cell right for consistency.
3) Add border-bottom for header-row so that on scroll to bottom header rows are differentiated from cells.
Also, due to these changes, the vertical scrollbar which appears at data-grid right side seems to fixed.
PFA patch and review.
Thanks,
Surinder