Fixed Login and Sign in Button UI inconsistency

[VinothanaBalakrishnan05]

##Description
Fixed the Login and sign up button,links UI(styles) to match with the website gradient
fixes #566

Type of change

• Bug fix
• New feature
• Improvement
• Documentation update

Screen shot:

This is the after images:

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code where necessary
• I have added tests that prove my fix is effective or that my feature works
• I have made corresponding changes to the documentation

[github-actions]

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