The blue down arrow wrongly exceeds the "Downloads" button area when the browser is resized to mobile view

[SoftVision-CosminMuntean]

[Affected versions]:

• Firefox 60.0.1 and up
• Safari 11.03
• Microsoft Edge 41.16299.402.0

[Affected Platforms]:

• All Windows
• All Mac
• All Linux

[Steps to reproduce]:

1. Start Firefox browser and navigate to https://send.dev.mozaws.net/.
2. Upload a file.
3. Reduce the size of the browser window until mobile view is reached.
4. Observe the down arrow from the "Downloads" button.

[Expected result]:

• The arrow is correctly displayed in the button.

[Actual results]:

• The down arrow is moved outside of the "Downloads" button.

[Notes]:

• This issue is also reproducible on stage and prod servers.
• The issue is not reproducible on Chrome.
• Here is a screen recording with the issue:
  

[johngruen]

I bet if we just made the selector block level on responsive views this would get fixed

[SoftVision-CosminMuntean]

I have verified this issue on Send dev website and is partially fixed. The arrow is moved to the next row if the browser is resized to its minimum.

Here is a screen recording with the issue:

[dannycoates]

yeah that's as good as it's going to get. we could set a min-width on the page, but meh.