UI Filter input element may default to a monospaced font

[anchnk]

Thanks a lot for the work on that project which is really handy. I am opening this issue as a suggestion.

Would you accept a PR that would change the UI to use monospaced font for the filter input element ?
IMO this is much more readable for entering text that represents commands.

As it's just a small CSS change I can do the PR if you are ok with the idea