@media only screen and (min-width: 660px) {
    body {
        width: 40em;
        margin: 0 auto;
    }
}

@media only screen and (max-width: 660px) {
    body {
        margin: 0 10px;
    }
}

body {
    color: #121212;
    background-color: #fefefe;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif
}

.picture {
    border: 1px solid #121212;
    background: #f2f2f2;
    padding: 1em;
    padding-bottom: 0em;
}

.picture p {
    font-size: .9em;
    font-style: italic;
}

.note {
    color: red;
    font-style: normal;
    text-decoration: none;
}

.box {
    padding: 1em;
    border: 1px solid #121212;
    background: #f2f2f2;
}

.box h3 {
    text-align: center;
}

.warning {
    background: #FFDEAD;
    padding: 1em;
}

h2:target, h3:target {
    color: red;
}

li:target {
    background-color: #f1f1f1;
    border: 1px dashed;
    padding-left: 1px;
}

nav.chapter {
    text-align: center;
    display: block;
    margin-top: 1.33em;
    margin-bottom: 1.33em;
    margin-left: 0;
    margin-right: 0;
    font-weight: bold;
}

nav.site {
    text-align: center;
    font-style: italic;
}

img {
    max-width: 100%;
    border: 2px solid #121212;

}

blockquote {
    font-style: italic;
    background: #f1f1f1;
    padding: 1em;
}

.picture img {
    margin: auto;
    display: block;
}

.title {
    text-align: center;
}