How to remove empty space at end of page for mobile. devices and tablets?

https://codepen.io/dan130074/pen/WXVmwd
Here put the code on large monitors displayed well. Just starting to view on small devices footer'ohms empty space is formed
June 10th 19 at 16:25
1 answer
June 10th 19 at 16:27
What is a footer? #contact ? If Yes, then you have a fixed height is 700px

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