Can someone please help me. I get an error when I try to follow the instructions. So apparently there is something I misunderstand.

[HAPSagan]

I try to follow the guide on this page: https://community.home-assistant.io/t/rounded-dashboard-guide/543043
Everything seems ok until I com to this:
"So now that we added the cards, we need to style them. As you can see, we added a card-mod class named ‘graph’ to each sensor card. Let’s now go back to our Rounded.yaml and add this code below the already placed code. Don’t forget to replace or remove the font declaration."
When I copy the code into Rounded.yaml just below the existing code, I get the following message: "bad indentation of mapping entry" on the row: " hui-masonry-view:"

What am I doing wrong and what is the purpose of adding this as a separate step and not having it in the code from the beginning?

[HAPSagan]

I have now found another version of the code further down the thread where the indentation was different and now it works so I close this one myself.