CSS Logo Marquee / Ticker

Similar to the looping logos at the bottom of the hero section on http://webflow.com, this approach uses a wrapper div (.loop-track below) set to flex horizontal, with two identical collection list of logos in it that are also flex horizontal with the logos in them. The CSS below then sets an animation that moves each of the two collection list 100% to the left, then we set the animation to infinite loop for 60s with linear easing.