Add padding to home notice alert box

Created by: thenamankumar

closes #22120 (closed)

Added 0.5rem padding to the notice alert boxes on the search homepage.

Screenshots

BEFORE	AFTER

Test plan

• Follow link to set notices in user settings.
• Visit /search and check padding for notice alert boxes.

App preview:

• Web
• Storybook

Check out the client app preview documentation to learn more.