Missing bottom margin

I have the following page htt ps://gand alf458.co.u k/map1.html

All works fine except the bottom margin isn’t showing. I notice that the body and the container div do not extend to the full length of the page, but I don’t know why. It reminds me of the clearfix probs of olden days.

Try deleting:

html, body {
  height: 100%;
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Great, thanks!

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