The wrapper you could set a percentage with if you want (if not it defaults to 100%) AND set a
max-width the same as your current
width and get the best of both worlds.
Then, if you have any other full width elements inside the wrapper you can just delete the widths altogether and they should default to 100%.
You may have issues with your slider because the images are 1024px wide so you’d need to find a way to scale those.
Also, you’d need to look into doing something about the menu breaking once the width gets below 1024px wide.