Viewport

The area in your browser where web page content is displayed.

Font Size Property

It is used to set the size of your font.

Text Decoration Property

Gives you the option to underline text

Hexadecimal

A number system based on 16.

Opacity

The Transparency or opaque your color will display.

Common Color Based Properties

color and background-color.

div tag

division.

Border Style

The consistency of the border.