diff --git a/tool/md2html/style.css b/tool/md2html/style.css
index 9f697ea374..378a8cf492 100644
--- a/tool/md2html/style.css
+++ b/tool/md2html/style.css
@@ -1,26 +1,46 @@
-table {
-    border-collapse: collapse;
+body {
+	font-family: sans-serif
 }
 
-table > thead th {
-    border: 1px solid black;
-    border-bottom: 2px solid black;
+a:not(:hover) {
+	text-decoration: none
+}
+
+thead {
+	background: #fafafa
+}
+
+details:not([open]) summary>h3 {
+	text-decoration: underline
+}
+
+details summary {
+	cursor: pointer
+}
+
+table {
+	border-collapse: collapse;
+}
+
+table>thead th {
+	border: 1px solid black;
+	border-bottom: 2px solid black;
 }
 
 td {
-    border: 1px solid black;
-    padding: 0.8em;
+	border: 1px solid black;
+	padding: 0.8em;
 }
 
 img {
-    max-width: 100%;
+	max-width: 100%;
 }
 
-summary > * {
-    /* 
+summary>* {
+	/* 
      * Make summary display on the same line, instead of
      * splitting into multiple lines
      */
 
-    display: inline-flex;
+	display: inline-flex;
 }
\ No newline at end of file