if you want the world map to behave like the slide show, try giving it the property width: 100%
Otherwise, it looks like the world map image is keeping the proportions. As you make the browser smaller, it keeps 50% of the remaining width. Is this not what you want?
I checked your code and I think the image is already keeping 50% of the width, even when you make the browser smaller. Measure the right and left margins, I think it is 50% all the time!
what i want is on a tablet / small device “Nearby Places of Interest” link and “Events and programs” link to have a font-size of 1 rem and right and left margins drawn in closer… i would like to experiment on this. and change the numbers to tweak