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---
id: 5d822fd413a79914d39e98fe
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title: Step 54
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challengeType: 0
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dashedName: step-54
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---
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# --description--
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Add these properties to `.bb2a` :
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```css
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margin: auto;
width: 5vw;
height: 5vw;
border-top: 1vw solid #000 ;
border-bottom: 1vw solid #000 ;
border-left: 1vw solid #999 ;
border-right: 1vw solid #999 ;
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```
After you add these, you can see how a thick border on an element gives you some angles where two sides meet. You are going to use that bottom border as the top of the building.
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# --hints--
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You should give `.bb2a` a `margin` of `auto` .
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```js
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assert.equal(new __helpers.CSSHelp(document).getStyle('.bb2a')?.margin, "auto");
```
You should give `.bb2a` a `width` of `auto` .
```js
assert.equal(new __helpers.CSSHelp(document).getStyle('.bb2a')?.width, "5vw");
```
You should give `.bb2a` a `height` of `5vw` .
```js
assert.equal(new __helpers.CSSHelp(document).getStyle('.bb2a')?.height, "5vw");
```
You should give `.bb2a` a `border-top` of `1vw solid #000` .
```js
assert.equal(new __helpers.CSSHelp(document).getStyle('.bb2a')?.borderTop, "1vw solid rgb(0, 0, 0)");
```
You should give `.bb2a` a `border-bottom` of `1vw solid #000` .
```js
assert.equal(new __helpers.CSSHelp(document).getStyle('.bb2a')?.borderBottom, "1vw solid rgb(0, 0, 0)");
```
You should give `.bb2a` a `border-left` of `1vw solid #999` .
```js
assert.equal(new __helpers.CSSHelp(document).getStyle('.bb2a')?.borderLeft, "1vw solid rgb(153, 153, 153)");
```
You should give `.bb2a` a `border-right` of `1vw solid #999` .
```js
assert.equal(new __helpers.CSSHelp(document).getStyle('.bb2a')?.borderRight, "1vw solid rgb(153, 153, 153)");
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```
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# --seed--
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## --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 bb1-window" > < / div >
< div class = "bb1b bb1-window" > < / div >
< div class = "bb1c bb1-window" > < / div >
< div class = "bb1d" > < / div >
< / div >
< div class = "bb2" >
< div class = "bb2a" > < / div >
< div class = "bb2b" > < / div >
< / 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;
--window-color2: #8cd9b3 ;
}
* {
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%;
}
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.bb1b {
width: 80%;
}
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.bb1c {
width: 90%;
}
.bb1d {
width: 100%;
height: 70%;
background: linear-gradient(
var(--building-color1) 50%,
var(--window-color1)
);
}
.bb1-window {
height: 10%;
background: linear-gradient(
var(--building-color1),
var(--window-color1)
);
}
.bb2 {
width: 10%;
height: 50%;
}
--fcc-editable-region--
--fcc-editable-region--
.bb2b {
width: 100%;
height: 100%;
background: repeating-linear-gradient(
var(--building-color2),
var(--building-color2) 6%,
var(--window-color2) 6%,
var(--window-color2) 9%
);
}
.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);
}
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.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);
}
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```
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