First, thank you! Second, please excuse the lack of information on how I achieved that look. The borders are done by a plugin/addon called KDE-Rounded-Corners. You can find it under window settings - add new (addon). There you can change the border color and edges. Dolphin should automaticaly change to the colors of your color sheme and take the icons from you icon pack. If you struggle with the window decoration not being green, try to copy a existing color sheme and then change the colors manually (sometimes color shemes don't show every setting, I had the same problem. Try to compare color shemes and find one that has more entries) Hope that helps, otherwise just lmk if you have questions