Fixing the stylesheet for the date selector

[phixMe]

Problem

The date selector got slightly out of proportion after the migration to the new version of Material. This fixes some of the margins and moves the label to be more inline with what the defaults are.

One-line summary:

The date selector now looks like:

Checklist

• You've signed-off your work
• Your changes are accompanied by tests (if relevant)
• Your change contains a small diff and is self-contained
• You've updated any relevant documentation (if relevant)
• You've included a one-line summary of your change for the CHANGELOG.md (Depending on the change, this may not be necessary).
• You've versioned your .sql database schema migration according to Flyway's naming convention (if relevant)
• You've included a header in any source code files (if relevant)