body {
    background: #ffc;
    margin: 10%;
    text-align: justify
    }
h2, h3, h4, h5, h6 {
    color: green;
    text-align: center
    }
blockquote {
    font-size: 0.9em
    }
p.poem {
    text-align: center
    }
p.external {
    font-weight: bold
    }