Hello! Here's a little struggle of mine, I am trying to hide the sidebar Expand/Collapse button on desktop, this due to some displaying issues with the Teaser slideshow which does not allow me to provide 2 sizes images to fill the whole width of the screen. Anyway, I tried some code on CSS which (to me) is correct but the buttom will still be displayed regardless of the code.
Is this correct? is there any other way to do this?