How to change position of the block icon when the screen reaches the element or the end of the page?

at the bottom of the page in the footer there is a block with 4 icons lined up in rows.
How to make what the first icon was fixed, and when you reach the end of the page or the item she was position:relative or absolute
June 5th 19 at 21:02
1 answer
June 5th 19 at 21:04
If you are considering the use of a plugin, try jquery.simple-scroll-follow

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