A row of space is missing between the “Logins and passwords imported to Firefox”...

[Affected versions]:

• Firefox Nightly 89.0a1 (Build ID: 20210322174641)
• Firefox Beta 88.0b2 (Build ID: 20210324160546)

[Affected Platforms]:

• Mac 11.2.3
• Windows 10 x64
• Ubuntu 20.04 x64

[Prerequisites]:

• Have the latest version of Firefox Nightly installed.
• Have saved on your computer a CSV file that contains only valid logins.

[Steps to reproduce]:

1. Open the Firefox browser.
2. Navigate to the "about:logins" page.
3. Click on the Menu button.
4. Select the “Import from a File…” option.
5. Select the CSV file from prerequisites and click on the “Open” button from the “Import Logins File” picker.
6. Click on the “View detailed Import Summary” link.
7. Observe the top part area from the “Import Summary Report” page.

[Expected result]:

• The spacing between the “Logins and passwords imported to Firefox” description and the “Learn more” link is larger.

[Actual result]:

• The spacing between the “Logins and passwords imported to Firefox” description and the “Learn more” link is missing.

[Notes]:

• Based on the mock-ups a row of space should be displayed under the “Logins and passwords imported to Firefox” description.
• Attached a screenshot with the issue.