Describe the bug
When I click on the website version of a newsletter, a css line table.button table td { background: #ef604d !important } is displayed on the top of the page

To Reproduce
Steps to reproduce the behavior:
Admin :

1. Go to BO
2. Click on newsletter
3. On index view, click on eye icon for access preview
4. Click on ‘View it on the website’
5. See unwanted css line

Receiver :

1. Click on ‘View it on the website’
2. See unwanted css line

Expected behavior
The css line should not be displayed.

Screenshots

Extra data (please complete the following information):

• Device: all
• Device OS:all
• Browser: all
• Decidim Version: 0.25.1