fix: dashboard signin login btn margin

[Chakravarthy7102]

Summary of change

Fixes signin form margin issue

Problem Statement

(A few sentences about why this change is being made)

Summary of solution

(Overview of how the problem is solved by this PR)

Related issues

• Link to issue1 here
• Link to issue1 here

Test Plan

Tested on all primary browsers for:

• Chrome
  • Desktop
  • Mobile
  • Tablet
• Safari
  • Desktop
  • Mobile
  • Tablet
• Firefox
  • Desktop
  • Mobile
  • Tablet
• (Optional) Tested on Safari 12 (Physical or emulator)
  • iPad
  • iPhone
• (Optional) Tested on physical mobile and tablet device for:
  • Android
  • iOS (including iPadOS)

Documentation changes

(If relevant, please create a PR in our docs repo, or create a checklist here highlighting the necessary changes)

Checklist for important updates

• Changelog has been updated
• Changes to the version if needed
  • In package.json
  • In package-lock.json
  • In src/version.ts
• Had run npm run build
• Had installed and ran the pre-commit hook

Remaining TODOs for this PR

• Item1
• Item2