A KDE Window Decoration based on vinceliuice's Jasper KDE theme. (It's very beautiful, go check it out)
It has round buttons with thin icons that can be clicked even if you don't center the circle shape exactly (they have a square hitbox, but they are round, hence the name of the decoration (I also am not good at names)).
It has a solid look and it follows the theme color so that it creates a seamless connection with the window.