[err4nt]

I've got a plugin[1] I use for something similar when it's a horizontal scrollable area. Scroll the boxes in the demo[2] to see the shadows appear/disappear when there is overflowed text on the left or right edge!

1: https://github.com/tomhodgins/jsincss-overflow

2: https://tomhodgins.github.io/jsincss-overflow/test/

[zzarcon]

That's pretty neat! thanks for sharing