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---
id: 5d822fd413a79914d39e98f0
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title: Step 40
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challengeType: 0
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dashedName: step-40
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---
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# --description--
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Gradients in CSS are a way to transition between colors across the distance of an element. They are applied to the `background` property and the syntax looks like this:
```css
gradient-type(
color1,
color2
);
```
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In the example, `color1` is solid at the top, `color2` is solid at the bottom, and in between it transitions evenly from one to the next. In `.bb1a` , add a gradient of type `linear-gradient` to the `background` property with `--building-color1` as the first color and `--window-color1` as the second.
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# --hints--
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You should apply a `background` to `.bb1a` .
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```js
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assert(new __helpers.CSSHelp(document).getStyle('.bb1a')?.background);
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```
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You should give the `background` a `linear-gradient` .
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```js
assert.include(new __helpers.CSSHelp(document).getStyle('.bb1a')?.background, 'linear-gradient');
```
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You should give the `background` a `linear-gradient` starting from `--building-color1` .
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```js
assert.include(new __helpers.CSSHelp(document).getStyle('.bb1a')?.getPropVal('background', true), 'linear-gradient(var(--building-color1');
```
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You should give the `background` a `linear-gradient` ending at `--window-color1` .
```js
assert.include(new __helpers.CSSHelp(document).getStyle('.bb1a')?.getPropVal('background', true), 'linear-gradient(var(--building-color1),var(--window-color1))');
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```
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# --seed--
## --seed-contents--
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```html
<!DOCTYPE html>
< html >
< head >
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< title > City Skyline< / title >
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< link href = "styles.css" rel = "stylesheet" / >
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< / head >
< body >
< div class = "background-buildings" >
< div > < / div >
< div > < / div >
< div class = "bb1" >
< div class = "bb1a" > < / div >
< div class = "bb1b" > < / div >
< div class = "bb1c" > < / div >
< div class = "bb1d" > < / div >
< / div >
< div class = "bb2" > < / div >
< div class = "bb3" > < / div >
< div > < / div >
< div class = "bb4" > < / div >
< div > < / div >
< div > < / div >
< / div >
< div class = "foreground-buildings" >
< div > < / div >
< div > < / div >
< div class = "fb1" > < / div >
< div class = "fb2" > < / div >
< div > < / div >
< div class = "fb3" > < / div >
< div class = "fb4" > < / div >
< div class = "fb5" > < / div >
< div class = "fb6" > < / div >
< div > < / div >
< div > < / div >
< / div >
< / body >
< / html >
```
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```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;
}
--fcc-editable-region--
.bb1a {
width: 70%;
height: 10%;
background-color: var(--building-color1);
}
--fcc-editable-region--
.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);
}
.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);
}
```