SPFX footer should be visible at the bottom of the page after the middle content is scrolled down

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SharePoint Modern Page Layout using Application Customizer, the middle/main content height was too small for the view-port, so tried to increase the middle/main content height through CSS, by doing so custom footer is getting disappeared.Refer here for SharePoint Modern Page

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 I want the middle content view to be increased or else the middle content should be visible to it's fullest view. and then the footer should be visible at the bottom of the page after the middle content is scrolled down