Remove extraneous div.

src/components/SolsticeApp.tsx

@@ -47,8 +47,7 @@ const ConnectedApp: FC = ({ children }) => {
     );
   }
 
-  // TODO: eliminate the need for this extra <div> wrapper.
-  return <div>{children}</div>;
+  return <div id="solstice-app">{children}</div>;
 };
 
 const SolsticeApp = () => (
@@ -58,11 +57,9 @@ const SolsticeApp = () => (
     </Route>
     <Route path="/">
       <ConnectedApp>
-        <div id="solstice-app">
-          <Header />
-          <MainPane />
-          <Footer />
-        </div>
+        <Header />
+        <MainPane />
+        <Footer />
       </ConnectedApp>
     </Route>
   </Switch>