Issue title: Header design isn't responsive to medium/large screens
 Issue body: <img width="1036" alt="Screenshot 2020-06-01 at 19 41 38" src="https://user-images.githubusercontent.com/8561090/83410093-eaf45f00-a43f-11ea-92f3-a0dbf61819f4.png">

 Comments: 
 Comment 0: This should be fixed now after recent design updates to the menu.
{'source': 'GithubIssues', 'repo_name_with_owner': 'mempool/mempool', 'issue_id': 628409493, 'repo_stars': 1003.0}