How do I get the index page's width to be 100% of the screen?

It sets it to 1200px when I select the desktop icon in the responsive menu.

When coding in HTML & CSS you can just add “body {width:100%;}” but entering percentages doesn’t seem to work on bubble’s property editor. So I’m stuck now.

My apologies for how basic this is, I’m extremely new to bubble and I’m struggling just to build an interface. Help!

Make sure “fixed width” isn’t checked.