These side panels slide out on mobile viewports and can be toggled using a button in "slide in/out" mode.
To enable this functionality, apply the .slide-on-mobile class along with
.slide-on-mobile-{left,right} to the panels.
When activated, the .slide-on-mobile-{left,right}-show class is toggled to reveal the panel.
A backdrop is automatically inserted right after the closing tag of the .slide-on-mobile
container. Typically, this slide
panel is paired with .layout-trimmed and .set-nav-minified for a clean and
streamlined appearance.