Apply some simple styling to the API help page.

static/api.css

@@ -1,8 +1,29 @@
+h1, h2 {
+    font-family: sans-serif;
+}
+
+div#help {
+    margin: auto;
+    max-width: 1200px;
+}
+
 span.code {
     font-family: monospace;
 }
 
 table.parameters {
+    margin: 1em 0;
+}
+
+table.parameters th {
+}
+
+table.parameters td {
+}
+
+table.parameters tr:first-child {
+    font-family: sans-serif;
+    font-size: 1.17em;
 }
 
 table.parameters td:first-child {