---
id: 5d822fd413a79914d39e9909
title: Part 65
challengeType: 0
dashedName: part-65
---
# --description--
You want `bb4` to share the properties of `bb1` that center the sections. Instead of duplicating that code, create a new class above the background building comment called `building-wrap`. Leave it empty for now; this class will be used in a few places to save you some coding.
# --hints--
test-text
```js
assert(/\.building-wrap\s*{\s*}/g.test(code));
```
# --seed--
## --seed-contents--
```html
freeCodeCamp Skyline Project
```
# --solutions--
```html
freeCodeCamp Skyline Project
```