Anchor ul-li blinks/flicker after click on a link problem

I decided to do a li hover effect. Cursor hovers on anchor li, li moves down to simulate a click effect.
Every time after li click I see one blink of anchor li background.
I googled Flash of original Content (or FOOC) add similar issues but can’t find the right answer :frowning:
I uploaded a snippet here
Can anyone advise on how I can stop this from happening?

Thanks for any help or suggestions you may have!