Update to most recent state

Wrap the top elements of the Countries list such that they can stick on top.

.countriestopwrapper p needs to be at the bottom, after the other p declarations, because of specificity issues.
It is needed because of margin/padding conflicts (e.g. collapsing margins).
Also removing leftover .countries formatting relating to scrolling.

customizetopwrapper and separator are sticky.
countriestopwrapper was changed to accommodate the new sticky elements.
Changing aside padding-top to allow for the customizetopwrapper to work seamlessly.
min-width is removed from .search and .select, as they break the flow. (might change the width of aside to fix)

This enables "scroll to top" when clicking the titles, allowing for easy going back-from the sections.

Added h2 hover formatting
Changed some stuff in .separator and .countriestopwrapper