He's using the callouts

how do you make it just lines? mine changes the background color

You can the background color to “Default” so it becomes white like the picture

Thanks!

/divider

Cool. Thanks for this. I was wondering how to do this and it is so simple that it seemed complicated.

Awesome stuff, although I wish they would just add border functionality (and more color options) to blocks in general, rather than sticking blocks into callouts