Pair selector imporvements

[EvgeniiaVak]

fixes #219
fixes #154

• fixes strange bottom margin
• adds shortcuts for search - /, enter, esc, arrows
• fixes the (i) info label showing up on top of the options
• adds scrollbar (not visible unless we have more pairs)

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[Radstakes]

This is great Ev, I like the keyboard shortcut and the search function will be really useful as we list more pairs. I can't read the code but the preview works great so approving on that basis.

[nguvictor]

Minor might be better as as different issue, but I get an auto complete that pops up. Might be my browser though. Otherwise this was a massive improvement. Great job!

[EvgeniiaVak]

@nguvictor yeah, the popup looks weird, maybe I can disable it somehow, what's your browser?

[nguvictor]

@EvgeniiaVak
It's Brave browser