diff --git a/discussion.php b/discussion.php
index 54014664fa..ed07cff8b5 100644
--- a/discussion.php
+++ b/discussion.php
@@ -35,6 +35,9 @@
 // Set the URL that should be used to return to this page.
 $PAGE->set_url('/mod/moodleoverflow/discussion.php', array('d' => $d));
 
+// The page should not be large, only pages containing broad tables are usually.
+$PAGE->add_body_class('limitedwidth');
+
 // Check if the discussion is valid.
 if (!$discussion = $DB->get_record('moodleoverflow_discussions', array('id' => $d))) {
     throw new moodle_exception('invaliddiscussionid', 'moodleoverflow');
diff --git a/index.php b/index.php
index 4c3ef65567..49e454e495 100644
--- a/index.php
+++ b/index.php
@@ -356,6 +356,10 @@
 $PAGE->navbar->add($string['moodleoverflows']);
 $PAGE->set_title($course->shortname . ': ' . $string['moodleoverflows']);
 $PAGE->set_heading($course->fullname);
+
+// The page should not be large, only pages containing broad tables are usually.
+$PAGE->add_body_class('limitedwidth');
+
 echo $OUTPUT->header();
 
 // Show the subscribe all option only to non-guest and enrolled users.
diff --git a/post.php b/post.php
index dd3edb4ffd..5baa519ba5 100644
--- a/post.php
+++ b/post.php
@@ -113,6 +113,9 @@
     $PAGE->set_title($course->shortname);
     $PAGE->set_heading($course->fullname);
 
+    // The page should not be large, only pages containing broad tables are usually.
+    $PAGE->add_body_class('limitedwidth');
+
     // The guest needs to login.
     echo $OUTPUT->header();
     $strlogin = get_string('noguestpost', 'forum') . '<br /><br />' . get_string('liketologin');
@@ -424,6 +427,9 @@
         $PAGE->set_title($course->shortname);
         $PAGE->set_heading($course->fullname);
 
+        // The page should not be large, only pages containing broad tables are usually.
+        $PAGE->add_body_class('limitedwidth');
+
         // Check if there are replies for the post.
         if ($replycount) {
 
@@ -773,6 +779,9 @@
 $PAGE->set_title("$course->shortname: $moodleoverflow->name " . format_string($toppost->subject));
 $PAGE->set_heading($course->fullname);
 
+// The page should not be large, only pages containing broad tables are usually.
+$PAGE->add_body_class('limitedwidth');
+
 // Display the header.
 echo $OUTPUT->header();
 
diff --git a/view.php b/view.php
index f94467617b..8867be8bd8 100644
--- a/view.php
+++ b/view.php
@@ -92,6 +92,9 @@
 
 $PAGE->requires->js_call_amd('mod_moodleoverflow/rating', 'init', [$USER->id, $marksetting->allowmultiplemarks]);
 
+// The page should not be large, only pages containing broad tables are usually.
+$PAGE->add_body_class('limitedwidth');
+
 // Output starts here.
 echo $OUTPUT->header();