---
id: 5d822fd413a79914d39e98d5
title: Part 13
challengeType: 0
dashedName: part-13
---

# --description--

Give your `bb1` element these style properties: `display: flex;`, `flex-direction: column;`, and `align-items: center;`. This will center the parts of the building using "flex" or "flexbox". You will learn about it in more detail on another project.

# --hints--

test-text

```js
const bb1 = $('.bb1');
assert(
  bb1.css('display') === 'flex' &&
    bb1.css('flex-direction') === 'column' &&
    bb1.css('align-items') === 'center'
);
```

# --seed--

## --seed-contents--

```html
<!DOCTYPE html>
<html>    
  <head>
    <title>freeCodeCamp Skyline Project</title>
    <style>
      * {
        border: 1px solid black;
        box-sizing: border-box;
      }

      body {
        height: 100vh;
        margin: 0;
        overflow: hidden;
      }

      .background-buildings {
        width: 100%;
        height: 100%;
      }

      .bb1 {
        width: 10%;
        height: 70%;
      }

      .bb1a {
        width: 70%;
        height: 10%;
      }
  
      .bb1b {
        width: 80%;
        height: 10%;
      }
  
      .bb1c {
        width: 90%;
        height: 10%;
      }

      .bb1d {
        width: 100%;
        height: 70%;
      }
    </style>
  </head>

  <body>
    <div class="background-buildings">
      <div class="bb1">
        <div class="bb1a"></div>
        <div class="bb1b"></div>
        <div class="bb1c"></div>
        <div class="bb1d"></div>
      </div>
    </div>
  </body>
</html>
```

# --solutions--

```html
<!DOCTYPE html>
<html>    
  <head>
    <title>freeCodeCamp Skyline Project</title>
    <style>
      * {
        border: 1px solid black;
        box-sizing: border-box;
      }

      body {
        height: 100vh;
        margin: 0;
        overflow: hidden;
      }

      .background-buildings {
        width: 100%;
        height: 100%;
      }

      .bb1 {
        width: 10%;
        height: 70%;
        display: flex;
        flex-direction: column;
        align-items: center;
      }

      .bb1a {
        width: 70%;
        height: 10%;
      }
  
      .bb1b {
        width: 80%;
        height: 10%;
      }
  
      .bb1c {
        width: 90%;
        height: 10%;
      }

      .bb1d {
        width: 100%;
        height: 70%;
      }
    </style>
  </head>

  <body>
    <div class="background-buildings">
      <div class="bb1">
        <div class="bb1a"></div>
        <div class="bb1b"></div>
        <div class="bb1c"></div>
        <div class="bb1d"></div>
      </div>
    </div>
  </body>
</html>
```
