Implement overlay popup

client/layout.js

@@ -5,6 +5,7 @@ import m from "mithril";
 import menu from "./menu";
 import drawerComponent from "./drawer-component";
 import userMenu from "./user-menu";
+import * as overlay from "./overlay";
 
 const layout = {
   view: vnode => {
@@ -15,7 +16,8 @@ const layout = {
         m(menu, { page: vnode.attrs.page }),
         m(drawerComponent)
       ]),
-      m("#content", { class: `page-${vnode.attrs.page}` }, [vnode.children])
+      m("#content", { class: `page-${vnode.attrs.page}` }, [vnode.children]),
+      overlay.render()
     ];
   }
 };