Improve styling

[anikuri]

• Feature description: (Example: Add an exit button)

• Increase font consistency (within textboxes)
• Improve checkbox styling

• Reason for the feature or improvement: (Example: there is no right way to exit from the application)
  Inconsistent styling, fonts, etc. makes the program look outdated.

• How does your idea fit with the aim/scope of the project? (Example: feature gives the workflow)

• What are the merits of the feature? (Example: prevent data loss)
  Provide better UI/UX

• Screenshots, if you can show something similar, or a sketch:

• Any other information:
  Best to create a separate styles.css file.