docs-bug(cdkDrag): List examples' auto scroll is not working on devices narrower than 721px

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Dragging a list element of an example like connected sorting group and moving the item near the page border won't trigger auto scroll on pages narrower than 721px. Resize the page to 721px or wider and it will work again. Last time it worked seems to be in vesion 8 and it looks like it's caused by this flex-basis: auto property

Affected documentation page

https://material.angular.io/cdk/drag-drop/examples