style.css

.title-img {
    width: 100%;
}

body {
    font-family: Helvetica Neue, Helvetica, sans-serif;
}

/* From Jekyll theme minima */

@media screen and (max-width: 800px)  {
  .outer-container {
      max-width: -webkit-calc(800px - (30px));
      max-width: calc(800px - (30px));
      padding-right: 15px;
      padding-left: 15px;
  }

}

.outer-container{
    max-width: -webkit-calc(800px - (30px * 2));
    max-width: calc(800px - (30px * 2));
    margin-right: auto;
    margin-left: auto;
    padding-right: 30px;
    padding-left: 30px;
}

pre {
  background: #eef;
  overflow-x: auto;
}

.intro, .leader, aside, article {
    border: 2px solid #bbb;
    border-radius: 3px;
    margin: 10px 0;
    padding: 10px;
}

.chapter-group-title {
    margin: 60px 0 20px;
    padding: 5px;
    text-align: center;
    border-bottom: 2px solid #bbb;
}

ul {
    text-align: center;
    list-style: none;
    padding-left: 30px;
}

ul.toc {
    text-align: left;
    list-style: decimal;
}

a {
    color: #666;
}

a:visited {
    color: #bbb;
}

p {
    text-indent: 1em;
    line-height: 1.5;
}

.chapter-img {
    width: 50%;
    float: left;
}

.chapter-head {
    overflow: hidden;
    width: 100%;
    margin-bottom: 10px;
}

.chapter-title {
    text-align: center;
}

.chapter-info {
    width: 50%;
    float: left;
}

.chapter-info.full {
    width: 100%;
}

a[href="#"] {
    color: red;
}

.invisible {
    visibility: hidden;
}

.body-figure {
    width: 100%;
    margin: 0;
    color: #aaa;
    font-size: 11px;
    text-align: right;
}

.body-img {
    width: 100%;
}