How to remove this space please help

Which space do you mean?

Space between footer(in sky-blue color) and browser bottom line. This space only appears when I reduce browser size to 30% (Ctrl + Scroll down)
Note - margin and padding is set to zero by *(universal) selector and I am using only html and CSS.

looks like you need body element min-height to be 100vh maybe?

body {
    min-height: 100vh;

It’s difficult to tell without the HTML and CSS to hand.

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