Design of sidebar widget titles

Hi Sakin, I'd like to customize the style of my widget titles a little more. For example, I love the style of the titles in the sidebar of these websites: - https://www.22places.de/fotolocations-hongkong/ (turquoise background, turquouise line all the way to the right) - http://www.worldofwanderlust.com/(centered title, colored line to the left and right of it) I could change themes and get their themes instead, but I really love yours and don't want to change. Therefore, it would be great if you could let me know how to get these styles (maybe with CSS). Thanks a lot!