--- id: 612ead8788d28655ef8db056 title: Step 20 challengeType: 0 dashedName: step-20 --- # --description-- For the `.key.black--key::after`, set the `width` to `32px` and the `height` to `100px`. # --hints-- Your `.key.black--key::after` should have a `width` property set to `32px`. ```js assert(new __helpers.CSSHelp(document).getStyle('.key.black--key::after')?.width === '32px'); ``` Your `.key.black--key::after` should have a `height` property set to `100px`. ```js assert(new __helpers.CSSHelp(document).getStyle('.key.black--key::after')?.height === '100px'); ``` # --seed-- ## --seed-contents-- ```html Piano
``` ```css html { box-sizing: border-box; } *, *::before, *::after { box-sizing: inherit; } #piano { background-color: #00471b; width: 992px; height: 290px; margin: 80px auto; padding: 90px 20px 0 20px; } .keys { background-color: #040404; width: 949px; height: 180px; padding-left: 2px; } .key { background-color: #ffffff; position: relative; width: 41px; height: 175px; margin: 2px; float: left; } --fcc-editable-region-- .key.black--key::after { background-color: #1d1e22; content: ""; position: absolute; left: -18px; } --fcc-editable-region-- ```