The HTML example in the instructions is just that, an example, and not meant to be used in the solution. You’ll want to restart the step to get the original HTML and formatting back since formatting is very important for this step. Then, the only thing you want to do is use your space bar to add two extra spaces before the opening tags for each of the three children in main.
We need to be able to see your actual HTML code in here. To display your code in here you need to wrap it in triple back ticks. On a line by itself type three back ticks. Then on the first line below the three back ticks paste in your code. Then below your code on a new line type three more back ticks. The back tick on my keyboard is in the upper left just above the Tab key and below the Esc key.