header font corrected

[MadhusreeBera]

Description:

Header font color was incorrect for Dark and Light themes. I have changed the colors according to the design

Fixes #17

Type of change:

• [x] Bug fix (non-breaking change which fixes an issue)

Checklist:

• [x] My code follows the style guidelines of this project.
• [x] I have performed a self-review of my own code.
• [x] My changes generate no new warnings.
• [x] Any dependent changes have been merged and published in downstream modules.

Screenshots / Video:

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