You added three spaces to the three child elements instead of two. So you’ve pushed them over one space too far.
You’ve made changes to the HTML that you weren’t asked to make and this will cause you to fail.
I would suggest that you restart the step to get the original formatting back because formatting for this step is extremely important and you won’t pass unless it is exactly correct. The only thing you want to do is use your space bar to add two more spaces before the opening tag for each of the three child elements of main. That’s it. If you do anything else but this then you will probably not pass this step.