Title “Get your email domain for your aliases” on the your domain card is barely visible

[Bianca-O]

Build:
Stage

Affected platforms:
Windows 10 64-bit
macOS 10.14
Android 11
iOS 14.6

Browsers tested on:
Firefox

Preconditions:
The user has already upgraded to Mozilla Privacy Pack.
The user doesn’t have an email domain added yet.

Steps to reproduce:

1. Navigate to https://stage.fxprivaterelay.nonprod.cloudops.mozgcp.net and log in.
2. Observe the title on the your domain card.

Actual result:
The title is written with light grey color on white background and it is barely visible.

Expected result:
The title is written with dark color and it is visible.

[AOiegas]

Verified this issue on stage. The title of the Domain Name card is visible now.