.red{
    color: red;
    font-size: 50px;
    font-family: 'Courier New', Courier, monospace;
    border:1px solid red;
    width: 100px;
    background-color: yellow;
}
.green{
    color: green;
    font-size: 50px;
    font-family: 'Courier New', Courier, monospace;
    border:1px solid green;
    width: 100px;
    background-color: yellow;
}
.yellow{
    color: yellow;
}
.blue{
    color: blue;
}