[BUG] Fix dark mode design #169

[sarthak-kumar-shailendra]

1. Fixing bug reported by @samanyougarg in https://github.com/gita/gita-frontend-v2/issues/169

   

2. In the search bar (dark mode), the text color was grey, changed it to white

   

3. Fixing the dark mode modal design which appears on subscribing

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[samanyougarg]

Looks good, merged.