body {
    margin: 0px;
}

/*-------------- The body rule is to remove standard margin applied by the browser -----------------------*/
.red {
    color: red;
}

#big {
    font-size: 22px;
}

.purple {
    color: purple;
}

#small {
    font-size: 14px;
}

.blue {
    color: green;
}

#medium {
    font-size: 75px;
}