ヘッダーのコンテンツ幅を縮めた

resources/views/layouts/base.blade.php

@@ -20,6 +20,7 @@
         {{ csrf_field() }}
     </form>
 
+    <div class="container">
         <a href="{{ route('home') }}" class="navbar-brand">{{ config('app.name', 'Tissue') }}</a>
         <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
             <span class="navbar-toggler-icon"></span>
@@ -65,6 +66,7 @@
                 </form>
             @endguest
         </div>
+    </div>
 </nav>
 @if (session('status'))
 <div class="container">