The design can be improved. Nice work with the implementation, though. Please apply your creativity a little more.

Thanks , Sure I will do that.

@luckykumarirai Are you on this?

Yes,
I am working but can u explain what kind of design u want for better UI.i have added Navbar on this page.plz explain

The postfix operation should be invisible, and should appear only when conversion results are shown. Also, what does the leftmost button do?

okay, I will add all those features which u mentation.

Now postfix operation only visible after a click on submit and the design also improved.
##Before submit-

##After submit-

Nice work with the UI. However, I do not see the conversion pages for other routes. Can you do that, if not, I would have to create new issue.

Please accept this PR and you should create new issues sure I can work on that issue also.