companion object {
        val editor by cssclass()
        val toolbox by cssclass()
        val toggleBtn by cssclass("toggle-button")
    }
//not working
s(editor) {
            s(toolbox) {
                s(toggleButton) {
                    backgroundInsets = multi(box(0.px), box(1.px), box(2.px))
                    backgroundRadius = multi(box(3.px), box(2.px), box(1.px))
                }

            }
        }
//working
s(editor) {
            s(toolbox) {
                s(toggleBtn) {
                    backgroundInsets = multi(box(0.px), box(1.px), box(2.px))
                    backgroundRadius = multi(box(3.px), box(2.px), box(1.px))
                }

            }
        }