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Back to top(fixed) stop before footer

Hi, I have a back to top arrow on my site. I have set it to fixed. I want it to stop before the footer but it goes on it. Please help me I am stuck on this. Thanks

Here is my site Read-Only: LINK

For those looking for an answer.
I found it on reddit by calm-calamari

Set the arrow link block to sticky, 90% from top and the content div to relative. It worked for me