main.css

body {
    font-family: BlinkMacSystemFont, -apple-system, Helvetica Neue, Open Sans, Ubuntu, Arial, Helvetica, sans-serif;
    font-weight: 300;
    font-size: 15pt;
    margin: 0px;
    padding: 0px;
}

#main a {
    color: #55a;
}
#main a:visited {
    color: #55a;
}
#main a:hover {
    color: #259;
}

h1 {
    font-size: 1.2em;
    font-weight: normal;
    letter-spacing: 0.2em;
    text-align: center;
    margin:  0em;
    padding: 1em;
}

h1 a {
    color: #559;
    text-decoration: none;
}

h1 a:hover {
    color: orange;
    cursor: pointer;
}

#version {
    background: orange;
    border-radius: 50%;
    font-weight: bold;
    color: white;
    width: 3em;
    height: 3em;
    display: inline-block;
    text-align: center;
    line-height: 3em;
    letter-spacing: 0em;
}

h2 {
    font-size: 1.5em;
    margin-top: 2em;
}
h3 {
    margin-top: 3em;
}
h4 {
    margin-top: 3em;
}

.center {
    padding-left: 2em;
    padding-right: 2em;
    margin-left: auto;
    margin-right: auto;
}
#main {
    max-width: 35em;
}

#main p, ul, ol {
    line-height: 1.5em;
    margin-bottom: 1em;
}

#main li {
    margin-top: 1em;
    margin-bottom: 1em;
}

#main ul li {
    list-style: none;
    min-width: 10em;
}
#main ul li:before {
    display: inline-block;
    content: "\2014";
    margin-left: -1.5em;
    width: 1.5em;
    position: absolute;
}

#main textarea {
    width: 100%;
    height: 20em;
    resize: none;
    margin-top: 5px;
    margin-bottom: 5px;

    font-family: menlo, monaco, monospace;
    font-size: 10pt;
    padding: 5px;

    border: none;
    border-left: solid 1px #aaa;
}
#main textarea:focus {
    outline: none;
}

#main img {
    display: block;
    margin-left: auto;
    margin-right: auto;
    max-width: 100%;
}
img + .caption {
    text-align: center;
    font-size: 0.7em;
    color: #aaa;
}

#footer {
    margin-top: 10em;
    color: #aaa;
    font-size: 0.7em;
    padding: 5em;
}

code {
    margin-left: 0.2em;
    margin-right: 0.2em;
    padding: 0.2em;
    border-radius: 0.2em;
    background-color: #eee;
}

pre code {
    border-radius: 0.5em;
    padding: 0.5em;
    display: block;
    overflow: auto;
}


ol {
    counter-reset: tutorial-counter;
    position: relative;
}

ol li {
    list-style: none;
}

ol li:before {
    content: counter(tutorial-counter);
    counter-increment: tutorial-counter;

    font-weight: bold;
    border-radius: 50%;
    background-color: #559;
    width: 2em;
    height: 2em;
    display: inline-block;
    text-align: center;
    line-height: 2em;
    color: white;

    margin-left: -2em;

    position: absolute;
    left: 1em;
}

input[type="text"] {
    border: none;
    font-family: monospace;
    font-size: 1em;
    color: #559;
}

input[type="text"]:focus {
    outline: none;
}


nav {
    border-bottom: 2px solid #559;
    background: #fafafa;
}
nav ul {
    padding: 0;
    margin: 0;
}
nav ul a {
    text-decoration: none;
    color: #334;
    display: block;
    overflow: hidden;
    text-overflow: ellipsis;
    padding: 0.25em 0.5em; */
}
.page {
    display: block;
}

.page-title-active,
.page-heading-active a {
    color: #66f;
}

.page-heading {
    display: block;
    padding-left: 1.5em;
}


@media screen and (min-width: 36rem) {
    nav {
        position: fixed;
        width: 16rem;
        left: 0;
        top: 0;
        bottom: 0;
        white-space: nowrap;
        overflow-y: auto;
        font-size: 1rem;
        border-bottom: none;
        border-right: 2px solid #559;
    }
    body.docs-page {
        margin-left: 16rem;
    }
}

/* highlight.js */

.hljs{display:block;overflow-x:auto;padding:0.5em;background:#F0F0F0}.hljs,.hljs-subst{color:#444}.hljs-comment{color:#888888}.hljs-keyword,.hljs-attribute,.hljs-selector-tag,.hljs-meta-keyword,.hljs-doctag,.hljs-name{font-weight:bold}.hljs-type,.hljs-string,.hljs-number,.hljs-selector-id,.hljs-selector-class,.hljs-quote,.hljs-template-tag,.hljs-deletion{color:#880000}.hljs-title,.hljs-section{color:#880000;font-weight:bold}.hljs-regexp,.hljs-symbol,.hljs-variable,.hljs-template-variable,.hljs-link,.hljs-selector-attr,.hljs-selector-pseudo{color:#BC6060}.hljs-literal{color:#78A960}.hljs-built_in,.hljs-bullet,.hljs-code,.hljs-addition{color:#397300}.hljs-meta{color:#1f7199}.hljs-meta-string{color:#4d99bf}.hljs-emphasis{font-style:italic}.hljs-strong{font-weight:bold}