mobile: left value transition (between tablet and mobile breakpoints) are causing a jarring animation

[transiient]

Instead of changing the left value, try using an offset with margin-left to show/hide the menu.

Issue credit: u/_alright_then_

[abienz]

Hi thought this may help you.

translate() is a common option for performant animations: https://www.paulirish.com/2012/why-moving-elements-with-translate-is-better-than-posabs-topleft/