css psedo class

1button:hover {
2  color: blue;
3}
4
5A pseudo-class is a word such as :hover that makes its changes
6to the selected element by adding it along side the selector 
7before the curly braces in CSS instead of inside the curly 
8braces.
9
10You can search for a list of pseudo-class online.
11
12

1A pseudo-class is a selector that selects elements that are in a specific state, e.g. they are the first element of their type, or they are being hovered over by the mouse pointer