Fix font-size and color in sdk

[mishramonalisha76]

Expected Behaviour

Change the default dark mode color of chat

Change all label font to 14px.

Current Behaviour

Current font size and color is not proper

Reproduction steps

1. Go to '...'
2. Invoke function '...'
3. See error

Screenshots

Relevant Logs

No response

Dapp Env

Prod (app.push.org), Staging (staging.push.org), Dev (dev.push.org)

Browsers

No response