The dashboard items are different than the forum items.
You are free to make customizations to your own dashboard presentation by css, but know that as more features get added or updated within the dashboard, you will need to carry your customizations over as well.
In addition, if anything goes wrong with your default style, you are now left with a broken Dashboard, unable to fix the issue. Its probably best to keep the customized User Forum styles and the Dashboard styles separate from each other.
