diff --git a/static/css/tango.css b/static/css/tango.css
new file mode 100644
index 0000000..0788e30
--- /dev/null
+++ b/static/css/tango.css
@@ -0,0 +1,73 @@
+/* ==============================================================================
+ Tango (pandoc built-in style)
+ ==============================================================================
+ Style based on Pygments' "tango" colors.
+
+ This stylesheet was produced using Pandoc v2.0.5.
+
+ Pandoc is (c) 2006-2017 John MacFarlane (jgm@berkeley.edu).
+ Released under the GPL, version 2 or greater.
+ ------------------------------------------------------------------------------
+*/
+a.sourceLine { display: inline-block; line-height: 1.25; border-bottom: 0; }
+a.sourceLine { pointer-events: none; color: inherit; text-decoration: inherit; border-bottom: 0; }
+a.sourceLine:empty { height: 1.2em; position: absolute; border-bottom: 0; }
+.sourceCode { overflow: visible; }
+code.sourceCode { white-space: pre; position: relative; }
+div.sourceCode { margin: 1em 0; }
+pre.sourceCode { margin: 0; }
+@media screen {
+div.sourceCode { overflow: auto; }
+}
+@media print {
+code.sourceCode { white-space: pre-wrap; }
+a.sourceLine { text-indent: -1em; padding-left: 1em; }
+}
+pre.numberSource a.sourceLine
+ { position: relative; }
+pre.numberSource a.sourceLine:empty
+ { position: absolute; }
+pre.numberSource a.sourceLine::before
+ { content: attr(data-line-number);
+ position: absolute; left: -5em; text-align: right; vertical-align: baseline;
+ border: none; pointer-events: all;
+ -webkit-touch-callout: none; -webkit-user-select: none;
+ -khtml-user-select: none; -moz-user-select: none;
+ -ms-user-select: none; user-select: none;
+ padding: 0 4px; width: 4em;
+ color: #aaaaaa;
+ }
+pre.numberSource { margin-left: 3em; border-left: 1px solid #aaaaaa; padding-left: 4px; }
+div.sourceCode
+ { background-color: #f8f8f8; }
+@media screen {
+a.sourceLine::before { text-decoration: underline; }
+}
+code span.al { color: #ef2929; } /* Alert */
+code span.an { color: #8f5902; font-weight: bold; font-style: italic; } /* Annotation */
+code span.at { color: #c4a000; } /* Attribute */
+code span.bn { color: #0000cf; } /* BaseN */
+code span.cf { color: #204a87; font-weight: bold; } /* ControlFlow */
+code span.ch { color: #4e9a06; } /* Char */
+code span.cn { color: #000000; } /* Constant */
+code span.co { color: #8f5902; font-style: italic; } /* Comment */
+code span.cv { color: #8f5902; font-weight: bold; font-style: italic; } /* CommentVar */
+code span.do { color: #8f5902; font-weight: bold; font-style: italic; } /* Documentation */
+code span.dt { color: #204a87; } /* DataType */
+code span.dv { color: #0000cf; } /* DecVal */
+code span.er { color: #a40000; font-weight: bold; } /* Error */
+code span.ex { } /* Extension */
+code span.fl { color: #0000cf; } /* Float */
+code span.fu { color: #000000; } /* Function */
+code span.im { } /* Import */
+code span.in { color: #8f5902; font-weight: bold; font-style: italic; } /* Information */
+code span.kw { color: #204a87; font-weight: bold; } /* Keyword */
+code span.op { color: #ce5c00; font-weight: bold; } /* Operator */
+code span.ot { color: #8f5902; } /* Other */
+code span.pp { color: #8f5902; font-style: italic; } /* Preprocessor */
+code span.sc { color: #000000; } /* SpecialChar */
+code span.ss { color: #4e9a06; } /* SpecialString */
+code span.st { color: #4e9a06; } /* String */
+code span.va { color: #000000; } /* Variable */
+code span.vs { color: #4e9a06; } /* VerbatimString */
+code span.wa { color: #8f5902; font-weight: bold; font-style: italic; } /* Warning */
diff --git a/templates/base.html b/templates/base.html
index f62e3ec..3eae63b 100644
--- a/templates/base.html
+++ b/templates/base.html
@@ -73,6 +73,7 @@
{% endif %}
+
{% if CUSTOM_CSS %}