Fixed positioningThe position: fixed CSS declaration removes an element from the normal flow and positions it relative to the viewport or page.positioningPositioningwidely2015-07-292018-01-29https://drafts.csswg.org/css-position-3/#abspos-insetscss-fixedhttps://developer.mozilla.org/docs/Web/CSS/Reference/Properties/positioncss.properties.position.fixedhttps://nowyoucanuse.com/features--fixed-positioning.html