Fix panel header overflow issue in Chrome

[jhawthorn]

This should fix an issue with the panel header under Chrome (at least on macOS).

I've tested this change in the inspector, but not "for reals", but I'm pretty sure it will work 🤞.

The need for this fix would probably be obsoleted by #137, but this is a much smaller change

cc @eileencodes @smashwilson who both spotted the issue

[robin850]

Thanks for spotting and fixing this !

Tested locally and confirm that this works properly with your fix. Version 1.1.0 has just been released with this fix.

[jonathanhefner]

For posterity: I was able to reproduce the issue in Chromium 80 on Linux, but not Firefox. I suspect it is a rendering bug in Chrome, because the issue corrects itself if you toggle margin-left: 25px; off and then back on for .panel .header input.

If for some reason the current fix doesn't work "for reals" (i.e. only works when using the inspector), an alternative might be to remove margin-left: 25px; from .panel .header input, and add padding-left: 25px; box-sizing: border-box; to .panel .header.