html {
    overflow: hidden;
}
/* Highlight Summery */
.book .book-summary ul.summary li a:hover, .book .book-summary ul.summary li.active > a {
    background: #b21818;
    color: #ffffff;
    text-decoration: none;
}

/* Header */
#logo {
    color: #fff;
    display: block;
    line-height: 40px;
    margin-left: 40%;
    width: 12%;
}

#logo img {
  margin-top: 0px;
  margin-left: 114px;
}

.logo_rubyfu {
height: 50px;
width: 67px;"
}

.wrap {
  display: block;
  margin: 0 auto;
  max-width: 1200px;
  padding: 0 10px;
}

#header {
  display: block;
  width: 100%;
  height: 55px;
  background: #444; 
  position: fixed;
  top: 0;
  z-index: 9;
}
#goTop, #anchors-navbar {
    display: none !important;
}
.book-summary {
    background: #444444 !important;
}
.book .book-summary .chapter.expanded > .articles {
    background: #555;
}
.book-summary ul.summary li a, .book-summary ul.summary li span {
    color: #fff;
}
.navigation, .book-header .btn {
    color: #b21818;
}
.markdown-section a {
    color: #b21818;
}
body {
    padding-top: 55px;
}
.book .book-body .page-wrapper .page-inner section.normal pre, .book .book-body .page-wrapper .page-inner section.normal code {
    background: #272822;
    color: #fff;
}
#book-search-input {
    background: #444;
    color: #fff;
}
.markdown-section pre {
    border: 3px solid #999;
    border-radius: 10px;
}
@media (max-width: 768px) {
    .book-body {
        left: 0 !important;
    }
    #logo img {
        margin-left: 0;
    }
}