.blockA{
    width: 100px;
    height: 100px;
    background-color: yellowgreen;
}

a:link{
    color: brown;
    text-decoration: none;
}

a:visited{
    color: red;
}

a:hover{
    background-color: black;
    color: white;
}

a:active{
    background-color: orange;
}