body {
    max-width: 60ch;
    margin: auto;
}

.poem > p{
    text-align: initial;
    text-indent: 0;
}

.poem > p + p{
    margin-top: 1em;
}

.poem > p > span{
    display: block;
    padding-left: 1em;
    text-indent: -1em;
}

.poem > p > span + br{
    display: none;
}

p span.i1{
    padding-left: 2em;
    text-indent: -1em;
}

p span.i2{
    padding-left: 3em;
    text-indent: -1em;
}

p span.i3{
    padding-left: 4em;
    text-indent: -1em;
}