Describe the bug

Disabled dropdowns are not grayed out like disabled inputs.

Steps to reproduce the bug

1. Setting the disabled attribute on a select element.

Expected behavior

1. A disabled select element should be grayed and have the same styling as disabled inputs.

Screenshots

System setup

• USWDS version: uswds@2.12.0
• Device: Macbook
• Operating system: Catalina (10.15.7)
• Browser and version: Chrome 93.0.4577.63

Additional context

I was doing some snooping on the HTML / CSS, and it seems like the background-color to gray it out is there but that it's being overriden.