made nextjs-ready config

src/containers/main/MainLayout/index.tsx

@@ -1,12 +1,14 @@
 import * as React from 'react';
 import styles from './styles.module.scss';
 import { Header } from '~/containers/main/Header';
+import { SidebarRouter } from '~/containers/main/SidebarRouter';
 
 export const MainLayout = ({ children }) => (
   <div className={styles.wrapper}>
     <div className={styles.content}>
       <Header />
       {children}
+      <SidebarRouter />
     </div>
   </div>
 );

src/containers/main/SidebarRouter/index.tsx

@@ -1,5 +1,4 @@
 import React, { FC } from 'react';
-import { createPortal } from 'react-dom';
 import { Authorized } from '~/components/containers/Authorized';
 import { SubmitBar } from '~/components/bars/SubmitBar';
 
@@ -8,17 +7,10 @@ interface IProps {
   isLab?: boolean;
 }
 
-const SidebarRouter: FC<IProps> = ({ isLab }) => {
-  if (typeof document === 'undefined') {
-    return null;
-  }
-
-  return createPortal(
-    <Authorized>
-      <SubmitBar isLab={isLab} />
-    </Authorized>,
-    document.body
-  );
-};
+const SidebarRouter: FC<IProps> = ({ isLab }) => (
+  <Authorized>
+    <SubmitBar isLab={isLab} />
+  </Authorized>
+);
 
 export { SidebarRouter };