[Edit] CSS [Edit] CSS: Flexbox `flex-basis`

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We would like to edit the flex-basis term entry under Flexbox concept in CSS. The entry lives in content/css/concepts/flexbox/terms/flex-basis/flex-basis.md.

Please refer to the term entry template, content standards, and markdown style guide when working on the PR for this issue.

Please:

1. Add a output image for the example already given in the entry.

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