hides api sections when there are no items to display

public/resources/css/base/_type.scss

@@ -94,6 +94,22 @@ code {
   line-height: 32px;
 }
 
+.docs-content {
+  h1 {
+    font-size: 24px;
+    opacity: 0.87;
+  }
+  h2 {
+    font-size: 20px;
+  }
+  h3 {
+    font-size: 16px;
+  }
+  h4 {
+    font-size: 16px;
+  }
+}
+
 table th,
 .text-subhead,
 .text-body,
@@ -168,7 +184,19 @@ table td {
   background: $snow;
 }
 
+.docs-content .l-sub-section {
+  padding: ($unit * 2) ($unit * 3);
+  h3 {
+    line-height: 1em;
+  }
+  pre:last-child {
+    margin-bottom: 0;
+  }
+}
 .docs-content .card-row {
+  > div > .card {
+    margin: $unit ($unit * 3);
+  }
   > div:first-child > .card {
     margin-left: 0;
   }