freeCodeCamp/curriculum/challenges/english/01-responsive-web-design/css-variables-skyline/part-056.md

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---
id: 5d822fd413a79914d39e9900
title: Part 56
challengeType: 0
dashedName: part-56
---
# --description--
Next, change the two `#999` of `bb2a` to `transparent`. This will make the left and right borders invisible.
# --hints--
test-text
```js
const bb2a = code.match(/\.bb2a\s*{[\s\S]+?[^}]}/g)[0];
assert(
/border-left\s*:\s*5vw\s+solid\s+transparent\s*(;|})/g.test(bb2a) &&
/border-right\s*:\s*5vw\s+solid\s+transparent\s*(;|})/g.test(bb2a)
);
```
# --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;
--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%;
}
.bb1b {
width: 80%;
}
.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%;
}
.bb2a {
margin: auto;
border-top: 1vw solid #000;
border-bottom: 1vw solid #000;
border-left: 5vw solid #999;
border-right: 5vw solid #999;
}
.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);
}
.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);
}
</style>
</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>
```
# --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;
--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%;
}
.bb1b {
width: 80%;
}
.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%;
}
.bb2a {
margin: auto;
border-top: 1vw solid #000;
border-bottom: 1vw solid #000;
border-left: 5vw solid transparent;
border-right: 5vw solid transparent;
}
.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);
}
.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);
}
</style>
</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>
```