Various &:active fixes

When pressing a button, especially on a touch device, you want feedback. Normally this is handled by elements like , but we have many elements that are not using that. To give feedback that a button has been pressed, we can use the active pseudo tag. A more ideal solution would be to never apply @click to random elements, but to style buttons etc.

I also tweaked a few animations and small things related to user-select: none when trying out the app on an iPad.