Tweaked colour styling
Tweaked gradient colors
Revert "Removed helper border on abbreviations"

This reverts commit 333d6a1453c433ea0972f65c2501fdd1f6dfee58.
Fix conflict
Revert b499abd..18f49f7

This rolls back to commit b499abde8a124057b1c52915cce12ed7ef47db49.
Remove gradient
Alter heading size styling
Merge branch 'master' into gh-pages