If you make the browser window displaying nasa.gov narrow enough that its menu switches to a hamburger style menu, selecting menu items will overlay the view. In Chrome I notice that the view updates so that the article content is still displayed, rather than overlaid.
1. Launch nasa.gov in Safari and Chrome
2. Make Safari/Chrome window narrow enough that menu becomes a hamburger menu.
3. Select any article from Home page
4. Click on the Menu from top right corner
The contents of the article/webpage is overlapped by the menu in Safari, but the page adjusts in Chrome.
This appears to be a flexbox issue.
When .side-bar__wrapper does not have the display: flex; property set (so it default to display: block) Chrome starts behaving like Safari. It seems to be related to our flexbox implementation.