!important

This style property adds more importance to a declaration. In the following example, the first three declarations have increased importance, while the last declaration has normal weight.

Example:

h1 { color: black !important; background: white !important }
p { font-size: 12pt !important; font-style: italic }

1. Universal Selector
2. Type Selector
3. Descendant Selector
4. Child Selector
5. Adjacent Sibling Selector
6. Class Selector
7. ID Selector
8. Simple Attribute Selector
9. Exact Attribute Value Selector
10. Partial Attribute Value Selector
11. Hyphen-separated Attribute Value Selector
12. !important