/**/
body {
    background: #ffc;
    margin: 10% 15% 10% 15%;
    text-align: justify
    }
/* top margin 1em,
right margin 2em,
bottom margin 3em,
left margin 4em */
h1, 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
    }
/**/