Buttons Ignoring Z-Order

Hello, I'm trying to figure out why my button plugin objects are not obeying the z order I have set up on the layer they exist. They are going to the top of all the layers no matter what, and I have to make them invisible if I want them to not show through a higher z or higher layer object like a fade In screen object or whatever. Only the mouse will show above them. A custom cursor object I'm using goes under the button as the mouse goes over it. Is this a CSS issue?

Thanks

Buttons are HTML elements that are drawn on the "web page" the game is displayed on, overtop of the canvas. They always ignore the Z-order of anything except other form elements (such as listboxes).

https://www.scirra.com/manual/111/button

Oh, I missed that sentence. I guess I'll be making my own button sprites. Thanks for the replies.