animate an element with a random animation-duration
https://css-tricks.com/random-numbers-css/
origin - http://www.pipiscrew.com/?p=6429 random-numbers-in-css
animate an element with a random animation-duration
https://css-tricks.com/random-numbers-css/
origin - http://www.pipiscrew.com/?p=6429 random-numbers-in-css