Changed overflowing issue on ongoing mentorship page

Purpose

The purpose of this PR is to fix #217

Fix the issue on UI of ongoing mentorship

Changed the css

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[ ] I have read and understood the development best practices guidelines ( http://bit.ly/sef-best-practices )
[ ] My code follows the style guidelines of this project
[ ] I have performed a self-review of my own code
[ ] I have commented my code, particularly in hard-to-understand areas
[ ] I have made corresponding changes to the documentation

## Test environment ## Learning