diff --git a/views/mail/index.php b/views/mail/index.php
index 2bfd5b1..e977ead 100644
--- a/views/mail/index.php
+++ b/views/mail/index.php
@@ -12,11 +12,11 @@
 ?>
 <div class="<?= ThemeHelper::isFluid() ? 'container-fluid' : 'container' ?><?= $messageId ? ' mail-conversation-single-message' : '' ?>">
     <div class="row">
-        <div class="col-md-4">
+        <div class="col-lg-4">
             <?= $this->render('_conversation_sidebar') ?>
         </div>
 
-        <div class="col-md-8 messages">
+        <div class="col-lg-8 messages">
             <?= ConversationView::widget(['messageId' => $messageId]) ?>
         </div>
     </div>
diff --git a/views/tag/manage.php b/views/tag/manage.php
index bdc8d09..4201748 100644
--- a/views/tag/manage.php
+++ b/views/tag/manage.php
@@ -23,7 +23,7 @@
 ?>
 <div class="container">
     <div class="row">
-        <div class="col-md-12">
+        <div class="col-lg-12">
             <div class="panel panel-default">
                 <div id="mail-conversation-header" class="panel-heading">
                     <?= Yii::t('MailModule.base', '<strong>Manage</strong> conversation tags') ?>
diff --git a/widgets/views/notificationInbox.php b/widgets/views/notificationInbox.php
index fb9e5e8..45fb801 100644
--- a/widgets/views/notificationInbox.php
+++ b/widgets/views/notificationInbox.php
@@ -32,7 +32,7 @@
             </div>
         </li>
         <li>
-            <a class="dropdown-item btn btn-light col-md-12" href="<?= Url::toMessenger() ?>">
+            <a class="dropdown-item btn btn-light col-lg-12" href="<?= Url::toMessenger() ?>">
                 <?= Yii::t('MailModule.base', 'Show all messages') ?>
             </a>
         </li>