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---
id: 5d822fd413a79914d39e98e1
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title: Step 25
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challengeType: 0
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dashedName: step-25
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---
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# --description--
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That one used the fallback value as well? I see the problem now! The variables you declared in `.bb1` do not cascade to the `.bb2` and `.bb3` sibling elements. That's just how CSS works. Because of this, variables are often declared in the `:root` selector. This is the highest level selector in CSS; putting your variables there will make them usable everywhere. Add the `:root` selector to the top of your stylesheet, and move all your variable declarations there.
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# --hints--
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You should declare a `:root` selector at the top of the stylesheet.
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```js
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assert.exists(new __helpers.CSSHelp(document).getStyle(':root'));
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```
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You should define `--building-color1` with a value of `#aa80ff` in the `:root` selector.
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```js
assert.equal(new __helpers.CSSHelp(document).getStyle(':root')?.getPropertyValue('--building-color1')?.trim(), '#aa80ff ');
```
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You should define `--building-color2` with a value of `#66cc99` in the `:root` selector.
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```js
assert.equal(new __helpers.CSSHelp(document).getStyle(':root')?.getPropertyValue('--building-color2')?.trim(), '#66cc99 ');
```
You should define `--building-color3` with a value of `#cc6699` in the `:root` selector.
```js
assert.equal(new __helpers.CSSHelp(document).getStyle(':root')?.getPropertyValue('--building-color3')?.trim(), '#cc6699 ');
```
You should remove the custom property variables from `.bb1` .
```js
assert.isEmpty(new __helpers.CSSHelp(document).getStyle('.bb1')?.getPropertyValue('--building-color1'));
assert.isEmpty(new __helpers.CSSHelp(document).getStyle('.bb1')?.getPropertyValue('--building-color2'));
assert.isEmpty(new __helpers.CSSHelp(document).getStyle('.bb1')?.getPropertyValue('--building-color3'));
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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" type = "text/css" / >
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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 >
< / body >
< / html >
```
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```css
--fcc-editable-region--
* {
border: 1px solid black;
box-sizing: border-box;
}
body {
height: 100vh;
margin: 0;
overflow: hidden;
}
.background-buildings {
width: 100%;
height: 100%;
display: flex;
align-items: flex-end;
justify-content: space-evenly;
}
.bb1 {
width: 10%;
height: 70%;
display: flex;
flex-direction: column;
align-items: center;
--building-color1: #aa80ff ;
--building-color2: #66cc99 ;
--building-color3: #cc6699 ;
}
--fcc-editable-region--
.bb1a {
width: 70%;
height: 10%;
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);
}
.bb2 {
width: 10%;
height: 50%;
background-color: var(--building-color2, green);
}
.bb3 {
width: 10%;
height: 55%;
background-color: var(--building-color3, pink);
}
.bb4 {
width: 11%;
height: 58%;
}
```
