.red{
    background-color:red;
    color:green;
}
.orange{
    background-color:orange;
    color:cyan;
}
.yellow{
    background-color:yellow;
    color:blue;
}
.green{
    background-color:green;
    color:red;
}
.blue{
    background-color:blue;
    color:yellow;
}