--- id: 5d822fd413a79914d39e98f2 title: Step 42 challengeType: 0 dashedName: step-42 --- # --description-- Add the new `bb1-window` class to the `.bb1a`, `.bb1b`, and `.bb1c` elements. This will apply the gradient to them. # --hints-- You should not remove the `bb1a` class. ```js assert.exists(document.querySelector('div.bb1a')); ``` You should add the `bb1-window` class to the `.bb1a` element. ```js assert.exists(document.querySelector('div.bb1a.bb1-window')); ``` You should not remove the `bb1b` class. ```js assert.exists(document.querySelector('div.bb1b')); ``` You should add the `bb1-window` class to the `.bb1b` element. ```js assert.exists(document.querySelector('div.bb1b.bb1-window')); ``` You should not remove the `bb1c` class. ```js assert.exists(document.querySelector('div.bb1c')); ``` You should add the `bb1-window` class to the `.bb1c` element. ```js assert.exists(document.querySelector('div.bb1c.bb1-window')); ``` You should not change the `.bb1d` element. ```js assert.exists(document.querySelector('div.bb1d')); assert.notExists(document.querySelector('div.bb1d.bb1-window')); ``` # --seed-- ## --seed-contents-- ```html City Skyline
--fcc-editable-region--
--fcc-editable-region--
``` ```css :root { --building-color1: #aa80ff; --building-color2: #66cc99; --building-color3: #cc6699; --building-color4: #538cc6; --window-color1: black; } * { border: 1px solid black; box-sizing: border-box; } body { height: 100vh; margin: 0; overflow: hidden; } .background-buildings, .foreground-buildings { width: 100%; height: 100%; display: flex; align-items: flex-end; justify-content: space-evenly; position: absolute; top: 0; } /* BACKGROUND BUILDINGS - "bb" stands for "background building" */ .bb1 { width: 10%; height: 70%; display: flex; flex-direction: column; align-items: center; } .bb1a { width: 70%; background-color: var(--building-color1); } .bb1b { width: 80%; height: 10%; background-color: var(--building-color1); } .bb1c { width: 90%; height: 10%; background-color: var(--building-color1); } .bb1d { width: 100%; height: 70%; background-color: var(--building-color1); } .bb1-window { height: 10%; background: linear-gradient( var(--building-color1), var(--window-color1) ); } .bb2 { width: 10%; height: 50%; background-color: var(--building-color2); } .bb3 { width: 10%; height: 55%; background-color: var(--building-color3); } .bb4 { width: 11%; height: 58%; background-color: var(--building-color4); } /* FOREGROUND BUILDINGS - "fb" stands for "foreground building" */ .fb1 { width: 10%; height: 60%; background-color: var(--building-color4); } .fb2 { width: 10%; height: 40%; background-color: var(--building-color3); } .fb3 { width: 10%; height: 35%; background-color: var(--building-color1); } .fb4 { width: 8%; height: 45%; background-color: var(--building-color1); position: relative; left: 10%; } .fb5 { width: 10%; height: 33%; background-color: var(--building-color2); position: relative; right: 10%; } .fb6 { width: 9%; height: 38%; background-color: var(--building-color3); } ```