Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

The signup page content is not vidible in dark mode

Expected behavior

the text should have proper contrast with background to enhance readiblity

Add screenshots (if applicable)

On which device or platform are you experiencing this bug?

Chrome

Confirmation

• I have read the Bitbox Contributing Guidelines
• I am a GSSOC-EXT contributor
• I am a HACKTOBERFEST contributor
• I have starred the Bitbox repository