Hello,
I've noticed a bug that when changing to certain Google Fonts, the "X" in the off-canvas close button becomes off-centered (too small) and when animated flops around - due to size variations in particular fonts.
This can be corrected with custom CSS via adding padding, line-height, or increasing size - but it would be nice not to have to. This icon would probably be better served with an SVG or font-awesome icon in a future update - or updating T4 css to account for font-size variations in this icon and ensure things remain centered.