Header section of Try-It experience is mispositioned

[Onokaev]

Describe the bug
The Try-It layout on big screens is distorted

To Reproduce
Steps to reproduce the behavior:

1. Go to https://developer.microsoft.com/en-us/graph/graph-explorer?theme=theme
2. Notice the header message is displayed on the left side
   

Expected behavior
The header message should be at the top of the page

Screenshots

Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context
Add any other context about the problem here.