Problem when trying to collapse/expand nodes in the right sidebar

[yakinbozek]

In the right sidebar, this theme is making the collapse/expand little triangle of each node very difficult to click on.
When hovering over that little triangle, it appears the little double arrow to change the right sidebar width. That little arrow should appear a few centimeters to the right when hovering over the middle vertical division line separating the right sidebar from the main panel.
It seems as if the pointer is always recognized to be a few centimeters to the left, than where it really is. And this behaviour makes it too difficult to click on the little triangles for collapse/expand as it conflicts with other elements' expected behavior.