Update Close and Save Button Colors When Editing a Deadline

Issue Description:
When editing an existing deadline description, the Close and Save buttons are not visually distinct enough. Update the button styling so that the Close button is red and the Save button is green.

This will make the available actions clearer and help users quickly distinguish between canceling/closing the edit form and saving their changes.

Expected Behavior:
While editing a deadline description, the Close button should appear red and the Save button should appear green, with no change to their existing functionality.

UI:

Start by locating the deadline description editing UI and its Close and Save button styles in the frontend. Update only their visual colors while preserving existing behavior, then run the relevant UI checks or manually verify that Close is red and Save is green during editing.

Written by the indexing model from the issue text.