Thread:Extension talk:Maps/Maps inside the Foreground skin/reply (2)

So the answer was found by thingles:

Here is what is happening... To make the this skin or any skin for that matter, responsive, you need the CSS code:

img { max-width: 100%; height: auto; }

Maps are being written directly as a div container and unfortunately the skin's CSS is the entire site for the img attribute. You will have to add

.gm-style img { max-width: none; }

to Mediawiki:Common.css.

I'll add the note to the front page since this fix should apply to all responsive skins (in theory)