Logo not resizing

Hi, I have the same issue as someone else above but can see it wasn't resolved (as far as the thread goes). The logo does not resize for different device sizes, and so it looks perfect on the web version, a bit large on the tablet version and doesn't fit at all on the mobile version (the right hand side is cut off). Our site is: https://dynamicyouththeatre.org/ Please can you help? Thank you, James & Sam