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diff --git a/source/infra/css/main.css b/source/infra/css/main.css
new file mode 100644
index 0000000..5127873
--- /dev/null
+++ b/source/infra/css/main.css
@@ -0,0 +1,99 @@
+/* Colour scheme */
+:root {
+	--b: #ededed;
+	--f: #121212;
+	--a: #0000ff;
+}
+.darkinv {}
+@media only screen and (prefers-color-scheme: dark) {
+	:root {
+		--b: #121212;
+		--f: #ededed;
+		--a: #ffff00;
+	}
+	.darkinv {filter: invert(100%)}
+}
+
+/* Basic elements */
+body {
+	background: #ededed;
+	background: var(--b);
+	color: #121212;
+	color: var(--f);
+
+	max-width: 80ch;
+	margin: auto;
+	padding: 1rem 0;
+
+	font-family: sans-serif;
+	line-height: 1.5;
+}
+h1,h2,h3 {text-align: center;}
+h1 {font-size: 2.0rem;}
+h2 {font-size: 1.6rem;}
+h3 {font-size: 1.2rem;}
+a {
+	text-decoration: none;
+	color: #0000ff;
+	color: var(--a);
+}
+img {
+	display: block;
+	max-width: 100%;
+	height: auto;
+	margin: auto;
+}
+
+/* Header and footer */
+.nav {
+	height: 3rem;
+	font-size: 2.4rem;
+	padding: 0.25rem 0;
+}
+.navl {
+	float: left;
+	text-align: left;
+}
+.navr {
+	float: right;
+	text-align: right;
+}
+.footl {
+	float: left;
+	text-align: left;
+}
+.footr {
+	float: right;
+	text-align: right;
+}
+@media only screen and (max-width: 72ch) {
+	.navl, .footl, .footr {width: 100%;}
+	.navr {
+		width: 100%;
+		font-size: 1.8rem;
+	}
+}
+.noha a:link, .noha a:visited {
+	color: #121212;
+	color: var(--f);
+}
+.noha a:hover, .noha a:focus, .noha a:active {
+	color: #0000ff;
+	color: var(--a);
+}
+
+/* Collapsible boxes */
+label {
+	color: #0000ff;
+	color: var(--a);
+	cursor: pointer;
+}
+.accordion {
+	display: block;
+	padding: 0.3rem 0.5rem;
+	border-style: dotted;
+}
+input {display: none;}
+input + label + .hidden {display: none;}
+input:checked + label {display: none;}
+input:checked + label + .hidden {display: block;}
diff --git a/source/infra/css/syntax.css b/source/infra/css/syntax.css
new file mode 100644
index 0000000..8772351
--- /dev/null
+++ b/source/infra/css/syntax.css
@@ -0,0 +1,147 @@
+/* From https://github.com/brazacz/rouge-themes/blob/main/css/github.css */
+.highlight      { background-color: #f8f8f8; }
+.highlight .bp  { color: #999999; }
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+.highlight .cpf { color: #999988; font-style: italic; }
+.highlight .cs  { color: #999999; font-weight: bold; font-style: italic; }
+.highlight .dl  { color: #dd1144; }
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+.highlight .gh  { color: #999999; }
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+.highlight .gs  { font-weight: bold; }
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+.highlight .kc  { color: #000000; font-weight: bold; }
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+.highlight .nv  { color: #008080; }
+.highlight .o   { color: #000000; font-weight: bold; }
+.highlight .ow  { color: #000000; font-weight: bold; }
+.highlight .s   { color: #dd1144; }
+.highlight .s1  { color: #dd1144; }
+.highlight .s2  { color: #dd1144; }
+.highlight .sa  { color: #000000; font-weight: bold; }
+.highlight .sb  { color: #dd1144; }
+.highlight .sc  { color: #dd1144; }
+.highlight .sd  { color: #dd1144; }
+.highlight .se  { color: #dd1144; }
+.highlight .sh  { color: #dd1144; }
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+.highlight .sr  { color: #009926; }
+.highlight .ss  { color: #990073; }
+.highlight .sx  { color: #dd1144; }
+.highlight .vc  { color: #008080; }
+.highlight .vg  { color: #008080; }
+.highlight .vi  { color: #008080; }
+.highlight .vm  { color: #008080; }
+.highlight .w   { color: #bbbbbb; }
+
+@media only screen and (prefers-color-scheme: dark) {
+/* From https://github.com/numist/highlight-css/blob/main/Pygments/github-dark.css */
+.highlight      { background-color: #0d1117; }
+.highlight .bp  { color: #c9d1d9; } /* Name.Builtin.Pseudo */
+.highlight .c   { color: #8b949e; font-style: italic; } /* Comment */
+.highlight .c1  { color: #8b949e; font-style: italic; } /* Comment.Single */
+.highlight .cd  { color: #8b949e; font-style: italic; } /* ? */
+.highlight .ch  { color: #8b949e; font-style: italic; } /* Comment.Hashbang */
+.highlight .cm  { color: #8b949e; font-style: italic; } /* Comment.Multiline */
+.highlight .cp  { color: #8b949e; font-weight: bold; font-style: italic; } /* Comment.Preproc */
+.highlight .cpf { color: #8b949e; font-style: italic; } /* Comment.PreprocFile */
+.highlight .cs  { color: #8b949e; font-weight: bold; font-style: italic; } /* Comment.Special */
+.highlight .dl  { color: #79c0ff; } /* Literal.String.Delimiter */
+.highlight .err { color: #f85149; } /* Error */
+.highlight .fm  { color: #d2a8ff; font-weight: bold; } /* Name.Function.Magic */
+.highlight .gd  { color: #ffa198; background-color: #490202; } /* Generic.Deleted */
+.highlight .ge  { color: #c9d1d9; font-style: italic; } /* Generic.Emph */
+.highlight .gh  { color: #79c0ff; font-weight: bold; } /* Generic.Heading */
+.highlight .gi  { color: #56d364; background-color: #0f5323; } /* Generic.Inserted */
+.highlight .go  { color: #8b949e; } /* Generic.Output */
+.highlight .gp  { color: #8b949e; } /* Generic.Prompt */
+.highlight .gr  { color: #ffa198; } /* Generic.Error */
+.highlight .gs  { font-weight: bold; } /* Generic.Strong */
+.highlight .gt  { color: #ff7b72; } /* Generic.Traceback */
+.highlight .gu  { color: #79c0ff; } /* Generic.Subheading */
+.highlight .il  { color: #a5d6ff; } /* Literal.Number.Integer.Long */
+.highlight .k   { color: #ff7b72; } /* Keyword */
+.highlight .kc  { color: #79c0ff; } /* Keyword.Constant */
+.highlight .kd  { color: #ff7b72; } /* Keyword.Declaration */
+.highlight .kn  { color: #ff7b72; } /* Keyword.Namespace */
+.highlight .kp  { color: #79c0ff; } /* Keyword.Pseudo */
+.highlight .kr  { color: #ff7b72; } /* Keyword.Reserved */
+.highlight .kt  { color: #ff7b72; } /* Keyword.Type */
+.highlight .kv  { color: #ff7b72; } /* ? */
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+.highlight .mh  { color: #a5d6ff; } /* Literal.Number.Hex */
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+.highlight .mo  { color: #a5d6ff; } /* Literal.Number.Oct */
+.highlight .mx  { color: #a5d6ff; } /* ? */
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+.highlight .nt  { color: #7ee787; } /* Name.Tag */
+.highlight .nv  { color: #79c0ff; } /* Name.Variable */
+.highlight .o   { color: #ff7b72; font-weight: bold; } /* Operator */
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