The problem about responsive web desing

responsive web desing 61. step. I dont understand how could I do. I wrote checked at first radio button but it didnt work

Hey and welcome to our forum.
Below your code,can you see a help button?
Click it,an editor will appear stating the lesson.step and your code.
It’s easy working with the actual code rather than a screenshot.

I don’t see in your screen shot where you added the checked attribute to the first radio button.