calc with view portal height (the view height of the device):
margin-top: calc(50vh - 20px)
CSS grids:
https://grid.layoutit.com/
https://css-tricks.com/snippets/css/complete-guide-grid/
https://www.w3.org/TR/css-grid-2/#subgrids
flexbox:
https://css-tricks.com/snippets/css/a-guide-to-flexbox/
selectors:
https://www.w3schools.com/cssref/css_selectors.asp
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