Ooooo!
Stand by for many different opinions
Me, myself and I rotate maps to match the aspect of the device (typically Portrait) rather than the PC (landscape).
so they can fill the screen space.
I also use 0 margins (inherited to the image)
The other thing I do is make sure the
width and
height styles ARE NOT absolutes . That locks the sizes. Use % and auto (some devices may not honor this) values, this means it will adjust to fit. In addition, using max-width or max-height in absolutes Limits the size to keep the distortion within limits.
(I keep my editor preview window the same size as my device)
In the CSS find the class assigned to the image, try:
width: 100% /* was 1080px */ ;
height: auto /* was 1920px */ ;
(I commented out the old values just in case. YMMV)