.poem {
margin: 0 5em;
}
.chapter {
margin: 1em;
}
.switcher {
float: right;
background-color: #ddd;
border: 1px solid #000;
margin: 10px;
padding: 10px;
font-size: .9em;
}
.switcher h3 {
margin: .5em 0;
}

#header {
clear: both;
}

body.large .chapter {
font-size: 1.5em;
}

body.narrow .chapter {
width: 250px;
}

.selected {
font-weight: bold;
}

.hidden {
display: none;
}

.hover {
cursor: pointer;
background-color: #afa;
}

有些是借鉴他人博客.如有影响,侵删.