This button will appear yellow initially. On hover it will turn orange. When you click it, it will turn red. I used :hover and :focus to adapt the style.
(The :active selector is usually used of links (i.e. <a> tags))
button{
background-color:yellow;
}
button:hover{background-color:orange;}
button:focus{background-color:red;}
a {
color: orange;
}
a.button{
color:green;
text-decoration: none;
}
a:visited {
color: purple;
}
a:active {
color: blue;
}<button>
Hover and Click!
</button>
<br><br>
<a href="#">Hello</a><br><br>
<a class="button" href="#">Bye</a>