Enhancement: Replace specific font sizes with slider

[developer-diganta]

Subject of the issue

Currently, there are just fixed font sizes. A better alternative to that would be adding a slider that changes the font size with the value from the slider

The highlighted part should be replaced with a slider

[DeepHansda]

sir, I would like to work on this issue.

[developer-diganta]

Sure

[DeepHansda]

thank you sir