This is regarding the padding below the footer. So I wanted to know is it by default or a bug.
What are you referring to, specifically?
Their is unnecessary padding present below the footer on the rust website.
Do you mean https://www.rust-lang.org/?
Well, I wouldn't call the 30px padding below the footer a bug. Though in my browsers, the padding isn't white like yours but the same colour as the footer itself.
Okay, Then why it is appearing different for me any clue ?
Actually, looking again at your screenshot, I don't think the white bar below the footer has anything to do with the padding at all. Unfortunately I can't reproduce it on my computer or mobile.
I'm missing the whole
<div id="loom-companion-mv3"> element which contains a
section element to which the padding is applied. Looks to me like this is coming from a chrome extension you've installed? Googling
loom-companion-mv3 led me to this site: Meet Loom’s New Chrome Extension: Simpler, Faster, Higher Performance | Loom.