HTML & CSS

Hi!, i've finished this challege buy im not pretty sure about certain things.

The first time i've finished it i submitted the solution but it get broken, so i decided to delete and start over again finding where the mistakes could be.

On first instace i limit the width of the body element to 1440px thinking that's the problem, that's why my layout always expand side to side, but doesnt work. On my browser fit very well. A friend of mine told me to limit not the main but the element's inside the main, so i decided to put the max-width on header & main and im about to submit the solution haha, so lets see.

As always any feedback will be very aprecciated. Thanks all!.