JS Code blocks inserts new lines

[ediardo]

Describe the bug
A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'https://emotion.sh/docs/css-prop#style-precedence'
2. Compare Kmdr's code blocks to the original code, see that new lines are added below a JSX tag

Expected behavior
Syntax Highlight for JS should not add new lines.

Screenshots

Desktop (please complete the following information):

• OS: macos
• Browser Chrome
• Version 4.7.12

Additional context
Add any other context about the problem here.

[ediardo]

May be related: Closing JSX tag is not placed correctly

https://material-ui.com/