When you make an overlay. With a group to make it show 500px wide and the other part of the screen transparent the blog text jumps a small amount to the right and does not stay in place. Not sure how to share the code. Seems not to show when i place it here, but this is it.

Navigation overlay (inner width 500px, background transparent)

• Group block (inner width 500px) - Drop shadow, background white, custom css -- height:100vw; --
  • Row
    - navigation overlay close
  • navigation