Hi Armin,
I just created a type of "vertical Grid" that I wanted to lay beneath the content of my website. You can look at the code here (https://jsfiddle.net/5k66obh2/) I used Flexbox to do that.
But when I now copy the code into the "Custom CSS & HTML" section from Lay Theme it totally destroys my website.
Is this because Lay Theme itself uses Flexbox?
Best,
Quirin