I made new “slide-responsively” for image menus, which is minimal standalone HTM/CSS/JS inspired by “sliding-door” from Wayne Connor
I’ve just kept the sliding door idea, and made it independent of a WordPress theme so it can be added to a site using another theme
Try shrinking the width of the browser or rotating your mobile device.
View Source to see the minimal elements needed.
Just replace the 7 images and links and go!