Responsive button for mobile layout added

[J3n50m4t]

As @vortex-5 wrote in #48 the layout for mobiles isn't perfect. I added a new responsive class which scales the buttons.

bwmon.css/bwmondark.css

• responsive class for buttons. I don't like adding it twice but we don't have a css that gets loaded by both themes (except bootstrap), so I added it twice for now

bwmon.html

• added new class to html

[vortex-5]

Oh that looks better than what I was going to do was to just change the flex box at the bottom to allow for wrapping so it can go multi-line or just to change the flex direction once the screen hits a certain size. I'll give your fix a try on my limited screen devices.

The main advantage to the wrapping is although it looks a bit ugly it will work on every device.

Alas I've been pretty busy lately and haven't had the time to do that one line fix I'll try and code review this so it can be merged when I get home.