p.caption {
  color: #777;
  margin-top: 10px;
}
p code {
  white-space: inherit;
}
pre {
  word-break: normal;
  word-wrap: normal;
}
pre code {
  white-space: inherit;
}

.book h1 {
  font-size: 1.9em !important;
}

.book h2 {
  font-size: 1.65em !important;
}

.book h3 {
  font-size: 1.2em !important;
}

html,body        {height:100%;}
.wrapper         {width:100%;height:100%;margin:0 auto;background:#CCC}
.h_iframe        {position:relative;}
.h_iframe .ratio {display:block;width:100%;height:auto;}
.h_iframe iframe {position:absolute;top:0;left:0;width:100%; height:100%;}