Heighten security according to Mozilla Observatory.

css/bovender.css

@@ -0,0 +1,29 @@
+.no-border {
+  border: 0;
+}
+
+.no-margin {
+  margin: 0;
+}
+
+.margin-right {
+  margin-right: 1em;
+}
+
+.margin-top {
+  margin-top: 16px;
+}
+
+.gravatar {
+  margin-right: 1em;
+}
+
+body {
+  padding: 18px;
+}
+
+iframe {
+  border: 0;
+  height: 250px;
+  width: 95%;
+}