CSS property value

Each declaration has a property and its value. The value chooses one out of many possible appearances for a given property.

Every property used in CSS has a set of values it can take. Most values are relatively simple keywords or numeric values. Some properties have few allowed values. For example, the text-align property can take 6: left, right, center, and a couple of more specific ones.^[1]

Other properties like color have a much larger number of possible values but also allow multiple value types. The color can be specified through hex and RGB values and color keywords.