freeCodeCamp/guide/english/certifications/responsive-web-design/css-flexbox/use-the-flex-wrap-property-to-wrap-a-row-or-column/index.md

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Use the flex-wrap Property to Wrap a Row or Column

Use the flex-wrap Property to Wrap a Row or Column

Setting the flex-wrap property to wrap will make the columns go back to their specified width and the gree and black columns will be wraped to the begining of the frame.

Note that setting it to wrap-reverse will not make the grey empty space from the #box-container stay at the bottom while changing the columns order.