freeCodeCamp/curriculum/challenges/english/01-responsive-web-design/css-variables-skyline/part-029.md

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---
id: 5d822fd413a79914d39e98e5
title: Part 29
challengeType: 0
dashedName: part-29
---
# --description--
You want the foreground buildings container to sit directly on top of the background buildings element. Give it a `width` and `height` of `100%`, set the `position` to `absolute`, and the `top` to `0`. This will make it the same size as the body and move the start of it to the top left corner.
# --hints--
test-text
```js
const fb = code.match(/\.foreground-buildings\s*{[\s\S]+?[^}]}/g)[0];
assert(
$('.foreground-buildings').css('position') === 'absolute' &&
$('.foreground-buildings').css('top') === '0px' &&
/width\s*:\s*100%\s*(;|})/g.test(fb) &&
/height\s*:\s*100%\s*(;|})/g.test(fb)
);
```
# --seed--
## --seed-contents--
```html
<!DOCTYPE html>
<html>
<head>
<title>freeCodeCamp Skyline Project</title>
<style>
:root {
--building-color1: #aa80ff;
--building-color2: #66cc99;
--building-color3: #cc6699;
--building-color4: #538cc6;
}
* {
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;
}
.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);
}
.bb3 {
width: 10%;
height: 55%;
background-color: var(--building-color3);
}
.bb4 {
width: 11%;
height: 58%;
background-color: var(--building-color4);
}
</style>
</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>
</body>
</html>
```
# --solutions--
```html
<!DOCTYPE html>
<html>
<head>
<title>freeCodeCamp Skyline Project</title>
<style>
:root {
--building-color1: #aa80ff;
--building-color2: #66cc99;
--building-color3: #cc6699;
--building-color4: #538cc6;
}
* {
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;
}
.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);
}
.bb3 {
width: 10%;
height: 55%;
background-color: var(--building-color3);
}
.bb4 {
width: 11%;
height: 58%;
background-color: var(--building-color4);
}
.foreground-buildings {
width: 100%;
height: 100%;
position: absolute;
top: 0;
}
</style>
</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>
</body>
</html>
```