CSS not applied to the "closed" and "open" class

[ttungu]

There is no CSS for the close/open class which causes the sidebar to only show "dots" of the unordered list. Adding style in DevTools manually works (e.g. list-style-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAJAQMAAADAY3TdAAAABlBMVEUAAACZmZl+9SADAAAAAXRSTlMAQObYZgAAABZJREFUeAFjZmA+wNwAhiXMGcwBzAsAI6QEKNehQp8AAAAASUVORK5CYII=) )

I hope my description is understandable (im not a developer).