diff --git a/src/docs/theme/jaybird-html/README.md b/src/docs/theme/jaybird-html/README.md
index 46d0e87b6..787da91ca 100644
--- a/src/docs/theme/jaybird-html/README.md
+++ b/src/docs/theme/jaybird-html/README.md
@@ -1,7 +1,14 @@
 firebird-html theme
 ===================
 
-This theme is build using the asciidoctor-stylesheet-factory.
-The source of the theme can be found in branch `firebird` of <https://github.com/mrotteveel/asciidoctor-stylesheet-factory>.
+This theme is a manual modification of the standard Asciidoctor theme (<https://cdn.jsdelivr.net/gh/asciidoctor/asciidoctor@2.0/data/stylesheets/asciidoctor-default.css>). See also [Customize the default stylesheet](https://docs.asciidoctor.org/asciidoctor/latest/html-backend/default-stylesheet/#customize-the-default-stylesheet).
 
-When updating, remove comments with `/\*.*?\*/` and replace multiple linebreaks using `(?:\r?\n){2,}` replacement `\n`
\ No newline at end of file
+Specifically, it includes: 
+
+- different colors (headings and code blocks)
+- some margin changes
+- some tweaks to layout/rendering of some elements
+- extra h7 element (same styling as h6)
+- styles for tocbot (which replaces the default table of contents)
+
+Updating it requires downloading the Asciidoctor default stylesheet and careful diffing (and deciding which changes need to be preserved or not).
diff --git a/src/docs/theme/jaybird-html/firebird.css b/src/docs/theme/jaybird-html/firebird.css
index e27d85f62..f3debcd70 100644
--- a/src/docs/theme/jaybird-html/firebird.css
+++ b/src/docs/theme/jaybird-html/firebird.css
@@ -1,462 +1,440 @@
-@import url(https://fonts.googleapis.com/css?family=Open+Sans:300,300italic,400,400italic,600,600italic|Noto+Serif:400,400italic,700,700italic|Droid+Sans+Mono:400,700);
-article, aside, details, figcaption, figure, footer, header, hgroup, main, nav, section, summary { display: block; }
-audio, canvas, video { display: inline-block; }
-audio:not([controls]) { display: none; height: 0; }
-[hidden], template { display: none; }
-script { display: none !important; }
-html { font-family: sans-serif;  -ms-text-size-adjust: 100%;  -webkit-text-size-adjust: 100%;  }
-body { margin: 0; }
-a { background: transparent; }
-a:focus { outline: thin dotted; }
-a:active, a:hover { outline: 0; }
-h1 { font-size: 2em; margin: 0.67em 0; }
-abbr[title] { border-bottom: 1px dotted; }
-b, strong { font-weight: bold; }
-dfn { font-style: italic; }
-hr { -moz-box-sizing: content-box; box-sizing: content-box; height: 0; }
-mark { background: #ff0; color: #000; }
-code, kbd, pre, samp { font-family: monospace, serif; font-size: 1em; }
-pre { white-space: pre-wrap; }
-q { quotes: "\201C" "\201D" "\2018" "\2019"; }
-small { font-size: 80%; }
-sub, sup { font-size: 75%; line-height: 0; position: relative; vertical-align: baseline; }
-sup { top: -0.5em; }
-sub { bottom: -0.25em; }
-img { border: 0; }
-svg:not(:root) { overflow: hidden; }
-figure { margin: 0; }
-fieldset { border: 1px solid #c0c0c0; margin: 0 2px; padding: 0.35em 0.625em 0.75em; }
-legend { border: 0;  padding: 0;  }
-button, input, select, textarea { font-family: inherit;  font-size: 100%;  margin: 0;  }
-button, input { line-height: normal; }
-button, select { text-transform: none; }
-button, html input[type="button"], input[type="reset"], input[type="submit"] { -webkit-appearance: button;  cursor: pointer;  }
-button[disabled], html input[disabled] { cursor: default; }
-input[type="checkbox"], input[type="radio"] { box-sizing: border-box;  padding: 0;  }
-input[type="search"] { -webkit-appearance: textfield;  -moz-box-sizing: content-box; -webkit-box-sizing: content-box;  box-sizing: content-box; }
-input[type="search"]::-webkit-search-cancel-button, input[type="search"]::-webkit-search-decoration { -webkit-appearance: none; }
-button::-moz-focus-inner, input::-moz-focus-inner { border: 0; padding: 0; }
-textarea { overflow: auto;  vertical-align: top;  }
-table { border-collapse: collapse; border-spacing: 0; }
-meta.foundation-mq-small { font-family: "only screen and (min-width: 768px)"; width: 768px; }
-meta.foundation-mq-medium { font-family: "only screen and (min-width:1280px)"; width: 1280px; }
-meta.foundation-mq-large { font-family: "only screen and (min-width:1440px)"; width: 1440px; }
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-a:hover { cursor: pointer; }
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-object, embed { height: 100%; }
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-blockquote { margin: 0 0 1.25em; padding: 0.5625em 1.25em 0 1.1875em; border-left: 1px solid #ddd; }
-blockquote cite { display: block; font-size: 0.9375em; color: rgba(0, 0, 0, 0.6); }
-blockquote cite:before { content: "\2014 \0020"; }
-blockquote cite a, blockquote cite a:visited { color: rgba(0, 0, 0, 0.6); }
-blockquote, blockquote p { line-height: 1.6; color: rgba(0, 0, 0, 0.85); }
-.vcard { display: inline-block; margin: 0 0 1.25em 0; border: 1px solid #ddd; padding: 0.625em 0.75em; }
-.vcard li { margin: 0; display: block; }
-.vcard .fn { font-weight: bold; font-size: 0.9375em; }
-.vevent .summary { font-weight: bold; }
-.vevent abbr { cursor: auto; text-decoration: none; font-weight: bold; border: none; padding: 0 0.0625em; }
-@media only screen and (min-width: 768px) { h1, h2, h3, #toctitle, .sidebarblock > .content > .title, h4, h5, h6, h7 { line-height: 1.2; }
-  h1 { font-size: 2.75em; }
-  h2 { font-size: 2.3125em; }
-  h3, #toctitle, .sidebarblock > .content > .title { font-size: 1.6875em; }
-  h4 { font-size: 1.4375em; } }
-table { background: #fff; margin-bottom: 1.25em; border: solid 1px #dedede; }
-table thead, table tfoot { background: #FFEFD5; font-weight: bold; }
-table thead tr th, table thead tr td, table tfoot tr th, table tfoot tr td { padding: 0.5em 0.625em 0.625em; font-size: inherit; color: rgba(0, 0, 0, 0.8); text-align: left; }
-table tr th, table tr td { padding: 0.5625em 0.625em; font-size: inherit; color: rgba(0, 0, 0, 0.8); }
-table tr.even, table tr.alt, table tr:nth-of-type(even) { background: #f8f8f7; }
-table thead tr th, table tfoot tr th, table tbody tr td, table tr td, table tfoot tr td { display: table-cell; line-height: 1.6; }
-body { -moz-osx-font-smoothing: grayscale; -webkit-font-smoothing: antialiased; tab-size: 4; }
-h1, h2, h3, #toctitle, .sidebarblock > .content > .title, h4, h5, h6, h7 { line-height: 1.2; word-spacing: -0.05em; }
-.clearfix:before, .clearfix:after, .float-group:before, .float-group:after { content: " "; display: table; }
-.clearfix:after, .float-group:after { clear: both; }
-:not(pre, h1, h2, h3, #toctitle, h4, h5, h6, h7, h7):not([class^=L]) > code { font-size: 0.9375em; font-style: normal !important; letter-spacing: 0; padding: 0.1em 0.5ex; word-spacing: -0.15em; line-height: 1.45; text-rendering: optimizeSpeed; word-wrap: break-word; }
-:not(pre) > code.nobreak { word-wrap: normal; }
-:not(pre) > code.nowrap { white-space: nowrap; }
-pre { color: rgba(0, 0, 0, 0.9); font-family: "Droid Sans Mono", "DejaVu Sans Mono", "Monospace", monospace; line-height: 1.45; text-rendering: optimizeSpeed; }
-pre code, pre pre { color: inherit; font-size: inherit; line-height: inherit; }
-pre > code { display: block; }
-pre.nowrap, pre.nowrap pre { white-space: pre; word-wrap: normal; }
-em em { font-style: normal; }
-strong strong { font-weight: normal; }
-.keyseq { color: rgba(51, 51, 51, 0.8); }
-kbd { font-family: "Droid Sans Mono", "DejaVu Sans Mono", monospace; display: inline-block; color: rgba(0, 0, 0, 0.8); font-size: 0.65em; line-height: 1.45; background-color: #f7f7f7; border: 1px solid #ccc; -webkit-border-radius: 3px; border-radius: 3px; -moz-box-shadow: 0 1px 0 rgba(0, 0, 0, 0.2), 0 0 0 0.1em white inset; -webkit-box-shadow: 0 1px 0 rgba(0, 0, 0, 0.2), 0 0 0 0.1em white inset; box-shadow: 0 1px 0 rgba(0, 0, 0, 0.2), 0 0 0 0.1em white inset; margin: 0 0.15em; padding: 0.2em 0.5em; vertical-align: middle; position: relative; top: -0.1em; white-space: nowrap; }
-.keyseq kbd:first-child { margin-left: 0; }
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-.menuseq b.caret { font-size: 1.25em; line-height: 0.8; }
-.menuseq i.caret { font-weight: bold; text-align: center; width: 0.45em; }
-b.button:before, b.button:after { position: relative; top: -1px; font-weight: normal; }
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-p a > code:hover { color: rgba(0, 0, 0, 0.9); }
-#preheader > div.fb-logo, #header, #content, #footnotes, #footer { width: 100%; margin-left: auto; margin-right: auto; margin-top: 0; margin-bottom: 0; max-width: 62.5em; *zoom: 1; position: relative; padding-left: 1.25em; padding-right: 1.25em; }
-#preheader > div.fb-logo:before, #preheader > div.fb-logo:after, #header:before, #header:after, #content:before, #content:after, #footnotes:before, #footnotes:after, #footer:before, #footer:after { content: " "; display: table; }
-#preheader > div.fb-logo:after, #header:after, #content:after, #footnotes:after, #footer:after { clear: both; }
-#content { margin-top: 1.25em; }
-#content:before { content: none; }
-#header > h1:first-child { color: rgba(0, 0, 0, 0.85); margin-top: 2.25rem; margin-bottom: 0; }
-#header > h1:first-child + #toc { margin-top: 8px; border-top: 1px solid #dddddf; }
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-#header .details br { display: none; }
-#header .details br + span:before { content: "\00a0\2013\00a0"; }
-#header .details br + span.author:before { content: "\00a0\22c5\00a0"; color: rgba(0, 0, 0, 0.85); }
-#header .details br + span#revremark:before { content: "\00a0|\00a0"; }
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