Initial (redacted) commit.

docs/assets/extra_styles.css

@@ -0,0 +1,15 @@
+.mobile-frame {
+  width: 374px;
+  height: 676px;
+  padding: 80px 50px 40px 50px;
+  background-image: url("assets/images/mobile.jpg");
+  background-size: cover;
+  background-repeat: no-repeat;
+  margin: 1em auto;
+}
+
+.mobile-frame iframe {
+  width: 95%;
+  height: 90%;
+  background-color: darkgray;
+}