Weirdly, on the shadcn website it handles darkmode perfectly and when you click on it, the combobox popover is also dark. However, when I am doing the same in my website (literally copied the example code) with dark as the class on the top div, only the button itself is darkmode, and when clicking on the button, the popover is in lightmode. However, if i added dark class onto the popover itself, it then fixes. How can I correct this?