--- id: 612ec0490ae8626e9adf82e4 title: Step 31 challengeType: 0 dashedName: step-31 --- # --description-- You might have noticed the keys collapse when the browser window is smaller than `768px`. Set `overflow` to `hidden` in the first `.keys` selector, to take care of this issue. This property will hide any element that is pushed outside the set `width` value of `.keys`. # --hints-- Your original `.keys` selector should have the `overflow` property set to `hidden`. ```js assert(new __helpers.CSSHelp(document).getStyle('.keys')?.overflow === 'hidden'); ``` # --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; position: relative; border-radius: 10px; } --fcc-editable-region-- .keys { background-color: #040404; width: 949px; height: 180px; padding-left: 2px; } --fcc-editable-region-- .key { background-color: #ffffff; position: relative; width: 41px; height: 175px; margin: 2px; float: left; border-radius: 0 0 3px 3px; } .key.black--key::after { background-color: #1d1e22; content: ""; position: absolute; left: -18px; width: 32px; height: 100px; border-radius: 0 0 3px 3px; } .logo { width: 200px; position: absolute; top: 23px; } @media (max-width: 768px) { #piano { width: 358px; } .keys { width: 318px; } .logo { width: 150px; } } ```