reduce side margins on smaller screens

include/styleguide.css

@@ -264,3 +264,24 @@ address {
   display: block;
   margin-bottom: 1em;
 }
+
+@media only screen and (max-width: 800px) {
+  body {
+    margin-left: 50px;
+    margin-right: 50px;
+  }
+}
+
+@media only screen and (max-width: 640px) {
+  body {
+    margin-left: 1em;
+    margin-right: 1em;
+  }
+}
+
+@media only print {
+  body {
+    margin-left: 0;
+    margin-right: 0;
+  }
+}