Playground could use shorthand properties like: * [flex-flow](https://developer.mozilla.org/en-US/docs/Web/CSS/flex-flow) * [place-content](https://developer.mozilla.org/en-US/docs/Web/CSS/place-content) * [place-items](https://developer.mozilla.org/en-US/docs/Web/CSS/place-items) * [place-self](https://developer.mozilla.org/en-US/docs/Web/CSS/place-self) * [flex](https://developer.mozilla.org/fr/docs/Web/CSS/flex) Example: ```css .container { display: flex; flex-direction: column; flex-wrap: wrap; justify-content: center; align-content: center; } ``` could be shortened to: ```css .container { display: flex; flex-flow: column wrap; place-content: center; } ```