.centered {
    text-align: center;
}

.larger {
    font-size: large;
}

.medium {
    font-size: medium;
}

.small {
    font-size: small;
}

a {
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

#harvard {
    color: red;
}

#yale {
    color: blue;
}