I'm designing a mobile version of a site on muse and have created a hamburger side-menu that slides in from the right hand side to left hand side, now, as it only covers part of the width of the page (around 100px) I want to be able to shift whatever is being page displayed at that time to the left along with the menu.
e.g. side menu slides in from right - rest of page slides left to accommodate menu
I don't think you can do this readily using features built into Muse. Plus, if I understood right, I don't think it is a good idea to shift the page when the menu expands. I am not sure if that is a good idea.
You probably want to look at other mobile sites and see how they address this issue.