styles.css

@import url(https://fonts.googleapis.com/css?family=Open+Sans:400,700,400italic);

:root {
    --contrast-color: #0095DD;
    --contrast-color-over: #00539F;
    --contrast-color-translucid: rgba(0, 149, 221, 0.7);
    --contrast-color-over-translucid: rgba(0, 83, 159, 0.7);

    --bg-color: #f6f4ec;
    --bg-color-shadow: #d7d3c8;

    --text-color: #000;
    --text-color-contrast: #fff;

    --highlight: rgba(255, 255, 255, 0.9);
    --highlight-subtle: rgba(255, 255, 255, 0.5);
    --shadow: rgba(0, 0, 0, 0.2);
    --dark-shadow: rgba(0, 0, 0, 0.6);
}

body {
    font-family: 'Open Sans', sans-serif;
    font-size: 14px;
    padding: 1em;
    margin: 0;
    line-height: 1.3em;
    background: linear-gradient(to top, var(--bg-color-shadow) 0%, var(--bg-color) 100%) center center repeat;
}

body, html {
    min-height: 100%;
    box-sizing: border-box;
}

code, pre {
  font-family: Courier, 'Courier New', monospace;
  font-size: 1rem;
}

code {
  color: #666;
}

a {
    color: var(--contrast-color);
    text-decoration: none;
}

a:hover {
    color: var(--contrast-color-over);
    text-decoration: underline;
}

a.button {
    display: inline-block;
    color: var(--text-color-contrast);
    text-decoration: none;
    line-height: 1.25rem;
    box-sizing: border-box;
}

button, a.button {
    border: 0;
    background: var(--contrast-color);
    font-size: 1rem;
    padding: 0.5rem 1rem;
    color: #fff;
    transition: background 0.2s ease;
}

button:active, button:hover, a.button:active, a.button:hover {
    background: var(--contrast-color-over);
}

button[disabled] {
    background: #ccc;
    color: #666;
}

button[disabled]:hover {
    cursor: not-allowed;
}


p, li {
  margin: 1em 0;
}

li, dt, dd {
    margin: 0.8em 0;
}

dd {
    margin-left: 2em;
}

input[type=range], input[type=color] {
    vertical-align: bottom;
}

h1, h2, h3 {
    font-weight: normal;
    text-shadow: 0 1px 0 var(--highlight);
    color: #484848;
}

h1 {
    font-size: 2em;
    line-height: 1.25em;
}

iframe {
    border: none;
    overflow: scroll;
}

/* ---------------------------------------------------------------------------*/
/* layout */
/* ---------------------------------------------------------------------------*/

body.index {
    padding: 0;
    margin: 0;
    min-height: 100vh;
    overflow: auto;
}

.page-wrapper {
    display: flex;
    align-items: stretch;
    min-height: 100vh;
}

.sidebar {
    flex: 0 0 auto;
    border-right: 4px solid var(--shadow);
    width: 280px;
    box-sizing: border-box;
    padding: 0em 1em 1em 1em;
    text-align: center;
}

.viewer-wrapper {
    flex: 1 1 auto;
    overflow: hidden;
    position: relative;
}

.viewer {
    margin: 0;
    padding: 0;
    height: 100%;
    box-sizing: border-box;
    width: 100%;
    position: absolute; /* chrome doesn't just like height:100% :( */
}

/* helpers */
.panel {
    border-bottom: 2px solid var(--shadow);
    border-right: 2px solid var(--shadow);
    border-top: 2px solid var(--highlight);
    margin: 2em 0;
    padding: 1.5em;
    background: var(--bg-color);
}

.panel > *:first-child, .panel > header > * {
    margin-top: 0;
}

main.constrained {
    max-width: 900px;
    margin: 0 2em;
}

.burger {
    position: fixed;
    top: 0;
    left: 0;
    display: none;
    z-index: 10;
}

.burger button {
    padding: 0.2em;
}

.burger button, .view-source a {
    background: var(--contrast-color-translucid);
}

.burger button:hover, .view-source a:hover {
    background: var(--contrast-color-over-translucid);
}

.view-source {
    position: fixed;
    top: 0.5em;
    right: 0.5em;
    z-index: 10;
    display: none;
}

.view-source a:not(href~=http) {
    display: none;
}

@media (max-width: 900px) {
    .mobile-hidden {
        display: none;
    }

    .mobile-show {
        display: block;
    }

    .burger {
        display: block;
    }

    body {
        padding-top: 2em;
    }
    .page-wrapper {
        display: block;
        min-height: 0;
    }
    .sidebar {
        width: 100%;
        border: none;
    }
    .viewer-wrapper {
        height: 100vh;
    }
    .viewer-wrapper:not(.mobile-show) {
        display: none;
    }
}

/* ---------------------------------------------------------------------------*/
/* main menu */
/* ---------------------------------------------------------------------------*/
p.tagline {
    margin-top: -1em;
}
.menu {
    text-align: left;
    background: var(--bg-color);
}

.menu ul {
    padding-left: 0;
}
.menu li {
    display: block;
    line-height: 1.4em;
    border-bottom: 2px solid var(--shadow);
    border-top: 2px solid var(--highlight);
    margin: 0;
}

.menu a {
    padding: 1em;
    display: block;
}

.menu a:hover {
    text-decoration: none;
    background: var(--highlight-subtle);
}

.sidebar .button {
    width: 100%;
}

/* ---------------------------------------------------------------------------*/
/* custom tabzilla */
/* ---------------------------------------------------------------------------*/

#tabzilla {
    float: none;
}

#tabzilla a {
    box-shadow: none;
    margin: 0 auto;
}

#tabzilla a:hover {
    background-color: transparent;
}

#tabzilla:hover:before{
    background-color: #C13832;
}

#tabzilla:before {
    background: #4D4E53;
    left: 50%;
    margin-left: -44px;
}
/* ---------------------------------------------------------------------------*/
/* no browser support warning banner
/* ---------------------------------------------------------------------------*/

.no-support {
    background: var(--bg-color-shadow);
    padding: 1em;
}

/* ---------------------------------------------------------------------------*/
/* custom syntax highlight */
/* ---------------------------------------------------------------------------*/
pre[class*="language-"] {
    background: var(--highlight-subtle);
    margin: 1em 0;
}