This issue only happens to me from Chrome while in codepen’s Editor mode – regardless of which View I use and the size of the preview window. Whenever I change the background-color I’ll see diagonal, dotted, white lines running across the page preview. I see this in all but one of my pens (I tried copying that background color to another pen but the white lines persist).
Has anyone experienced something like this? If so, how did you fix it? I tried clearing cookies/cache etc but to no avail.
Here’s a pen that has these lines. When I’m looking at my other pens, only my Wikepedia Viewer doens’t have these lines running across the background.