Create a sticky sidebar using position sticky.
In this lesson:
Position sticky alternates the position of an element between relative and fixed based on the viewer’s scroll position. A sticky element is relative to the document flow until a defined scroll position is reached, then it switches to behaving like a fixed element within its direct parent. Once, the sticky element hits the bottom of its parent, it doesn’t scroll past it.
You must specify at least one position value for the top, bottom, left, or right side for sticky positioning to work. This depends on where your element is positioned within the parent and how you're scrolling, vertically or horizontally.
Sometimes, position sticky won't work even though you've set the position to sticky and defined a distance value for one of the sides of the element. That can happen for many reasons:
Position sticky may also not work if the position distance value is set on a side that isn't affected by the scrolling. For example, if you set the distance on the left or right, and you're scrolling through the page vertically, the element won't stick. Another example would be if you've set a distance to the bottom, for instance, instead of the top and your element is aligned to the top of the parent — it's either the first element in the parent or aligned to the top with flex or grid alignment settings.
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