#readinglist {
    column-width: 400px;
}

.book {
    text-decoration: underline;
}

.a {
    color: yellow;
}

.aa {
    color: orange;
}

.aaa {
    color: red;
}

.aaaa {
    color: blueviolet;
}

.aaaaa {
    color: springgreen;
}