Polish spring-javadoc.css.
Changes made:
- Used shorthand properties where suitable
- Removed redundant unit -px
- Inserted white-spaces after the colon for better readability
Comment From: wilkinsona
Thanks for the PR. Reviewing it made me realise that the file you've polished is no longer used so I've deleted it in https://github.com/spring-projects/spring-boot/issues/42187.