Add delay to React app error message

[niklasmh]

Purpose

Make React apps display: "Din nettleser må aktivere JavaScript for å kjøre denne applikasjonen..." after one second. Sometimes the message is displayed in production as of slow network.

Approach / Description of changes

Changed some CSS in _events.scss.

Code Checklist

• [x] The code follows our code conventions
• [ ] I have added tests for my code
• [ ] I have added documentation for my code