diff --git a/admin/lang.php b/admin/lang.php
index 98ab50c101c..53be0cd88dd 100644
--- a/admin/lang.php
+++ b/admin/lang.php
@@ -830,7 +830,7 @@
                     echo ($filetemplate);
                 }
                 echo "</textarea>\n</div>\n";
-                echo '<div style="text-align:center"><input type="submit" value="'.get_string('savechanges').'" /></div>';
+                echo '<div class="mdl-align"><input type="submit" value="'.get_string('savechanges').'" /></div>';
                 echo '</form>';
                 $preview_url = lang_help_preview_url($currentfile, !$uselocal);
                 if ($preview_url) {
diff --git a/admin/langdoc.php b/admin/langdoc.php
index 59194a871d2..617f42614a8 100755
--- a/admin/langdoc.php
+++ b/admin/langdoc.php
@@ -186,7 +186,7 @@ $langdir/$currentfile")."</font></p>";
             if ($preview_url) {
                 link_to_popup_window($preview_url, 'popup', get_string('preview'));
             }
-            echo '<div style="text-align:center"><input type="submit" value="'.get_string('savechanges').': lang/'.$currentlang.'/'.$currentfile.'" /></div>';
+            echo '<div class="mdl-align"><input type="submit" value="'.get_string('savechanges').': lang/'.$currentlang.'/'.$currentfile.'" /></div>';
             echo '</form>';
         }
 
diff --git a/admin/replace.php b/admin/replace.php
index c79b24346d3..9eb84cb54f7 100644
--- a/admin/replace.php
+++ b/admin/replace.php
@@ -19,7 +19,7 @@ print_heading('Search and replace text throughout the whole database');
 if (!data_submitted() or !$search or !$replace or !confirm_sesskey()) {   /// Print a form
 
     print_simple_box_start('center');
-    echo '<div style="text-align:center">';
+    echo '<div class="mdl-align">';
     echo '<form action="replace.php" method="post">';
     echo '<input type="hidden" name="sesskey" value="'.$USER->sesskey.'" />';
     echo 'Search whole database for: <input type="text" name="search" /><br />';
diff --git a/enrol/authorize/enrol.php b/enrol/authorize/enrol.php
index b88131bbffb..5931a8bb823 100755
--- a/enrol/authorize/enrol.php
+++ b/enrol/authorize/enrol.php
@@ -69,7 +69,7 @@ class enrolment_plugin_authorize
         print_simple_box_start('center', '80%');
         if ($USER->username == 'guest') { // only real guest user, not for users with guest role
             $curcost = get_course_cost($course);
-            echo '<div align="center">';
+            echo '<div class="mdl-align">';
             echo '<p>'.get_string('paymentrequired').'</p>';
             echo '<p><b>'.get_string('cost').": $curcost[currency] $curcost[cost]".'</b></p>';
             echo '<p><a href="'.$CFG->httpswwwroot.'/login/">'.get_string('loginsite').'</a></p>';
diff --git a/enrol/paypal/enrol.php b/enrol/paypal/enrol.php
index 30ac2c0f915..19950f434ac 100644
--- a/enrol/paypal/enrol.php
+++ b/enrol/paypal/enrol.php
@@ -51,7 +51,7 @@ function print_entry($course) {
                 // in unencrypted connection...
                 $wwwroot = str_replace("http://", "https://", $CFG->wwwroot);
             }
-            echo '<div style="text-align:center"><p>'.get_string('paymentrequired').'</p>';
+            echo '<div class="mdl-align"><p>'.get_string('paymentrequired').'</p>';
             echo '<p><b>'.get_string('cost').": $CFG->enrol_currency $cost".'</b></p>';
             echo '<p><a href="'.$wwwroot.'/login/">'.get_string('loginsite').'</a></p>';
             echo '</div>';
diff --git a/message/lib.php b/message/lib.php
index aaae465ab78..3963b896ef3 100644
--- a/message/lib.php
+++ b/message/lib.php
@@ -300,7 +300,7 @@ function message_get_contact($contactid) {
 function message_print_search_results($frm) {
     global $USER, $CFG;
 
-    echo '<div style="text-align:center">';
+    echo '<div class="mdl-align">';
 
     /// search for person
     if (!empty($frm->personsubmit) and !empty($frm->name)) {
diff --git a/mod/data/lib.php b/mod/data/lib.php
index 292b43b680b..ba26b3ff413 100755
--- a/mod/data/lib.php
+++ b/mod/data/lib.php
@@ -200,7 +200,7 @@ class data_field_base {     // Base class for Database Field Types (see field/*/
 
         require_once($CFG->dirroot.'/mod/data/field/'.$this->type.'/mod.html');
 
-        echo '<div style="text-align:center">';
+        echo '<div class="mdl-align">';
         echo '<input type="submit" value="'.$savebutton.'" />'."\n";
         echo '<input type="submit" name="cancel" value="'.get_string('cancel').'" />'."\n";
         echo '</div>';
diff --git a/mod/forum/lib.php b/mod/forum/lib.php
index 4072ee52a1b..569f3519220 100644
--- a/mod/forum/lib.php
+++ b/mod/forum/lib.php
@@ -900,7 +900,7 @@ function forum_make_mail_html($course, $forum, $discussion, $post, $userfrom, $u
     $posthtml .= forum_make_mail_post($course, $forum, $discussion, $post, $userfrom, $userto, false, $canreply, true, false);
 
     if ($canunsubscribe) {
-        $posthtml .= '<hr /><div style="text-align:center" class="unsubscribelink">
+        $posthtml .= '<hr /><div class="mdl-align unsubscribelink">
                       <a href="'.$CFG->wwwroot.'/mod/forum/subscribe.php?id='.$forum->id.'">'.get_string('unsubscribe', 'forum').'</a>&nbsp;
                       <a href="'.$CFG->wwwroot.'/mod/forum/unsubscribeall.php">'.get_string('unsubscribeall', 'forum').'</a></div>';
     }
diff --git a/mod/hotpot/index.php b/mod/hotpot/index.php
index 9f58f98700d..c847f8f49b5 100644
--- a/mod/hotpot/index.php
+++ b/mod/hotpot/index.php
@@ -117,7 +117,7 @@
                     print '</ul>';
                 }
                 print ''
-                .   '<div style="text-align:center"><table border="0"><tr><td>'
+                .   '<div class="mdl-align"><table border="0"><tr><td>'
                 .   '<form target="_parent" method="post" action="'.$ME.'">'
                 .   '<input type="hidden" name="id" value="'.$course->id.'" />'
                 .   '<input type="hidden" name="regrade" value="'.$regrade.'" />'
diff --git a/mod/hotpot/view.php b/mod/hotpot/view.php
index 9885f2ca1db..5df88e68bf3 100644
--- a/mod/hotpot/view.php
+++ b/mod/hotpot/view.php
@@ -71,13 +71,13 @@
             $boxwidth = 500;
             if (trim(strip_tags($hotpot->summary))) {
                 print_simple_box_start($boxalign, $boxwidth);
-                print '<div style="text-align:center">'.format_text($hotpot->summary)."</div>\n";
+                print '<div class="mdl-align">'.format_text($hotpot->summary)."</div>\n";
                 print_simple_box_end();
                 print "<br />\n";
             }
             print '<form id="passwordform" method="post" action="view.php?id='.$cm->id.'">'."\n";
             print_simple_box_start($boxalign, $boxwidth);
-            print '<div style="text-align:center">';
+            print '<div class="mdl-align">';
             print get_string('requirepasswordmessage', 'quiz').'<br /><br />';
             print '<b>'.get_string('password').':</b> ';
             print '<input name="hppassword" type="password" value="" /> ';
diff --git a/mod/lesson/highscores.php b/mod/lesson/highscores.php
index 0e369b997b8..5a5ac50342b 100644
--- a/mod/lesson/highscores.php
+++ b/mod/lesson/highscores.php
@@ -138,7 +138,7 @@
     switch ($mode) {
         case 'add':
             print_simple_box_start('center');
-            echo '<div style="text-align:center">
+            echo '<div class="mdl-align">
                  <form id="nickname" method ="post" action="'.$CFG->wwwroot.'/mod/lesson/highscores.php" autocomplete="off">
                  <input type="hidden" name="id" value="'.$cm->id.'" />
                  <input type="hidden" name="mode" value="save" />
diff --git a/mod/resource/type/file/localfile.php b/mod/resource/type/file/localfile.php
index 84d7eabb313..8a65240b8d8 100644
--- a/mod/resource/type/file/localfile.php
+++ b/mod/resource/type/file/localfile.php
@@ -33,7 +33,7 @@
     </script>
     
     <br />
-    <div style="text-align:center" class="form">
+    <div class="form mdl-align">
     <form id="myform">
     <fieldset class="invisiblefieldset">
     <input type="file" size="60" name="myfile" /><br />
diff --git a/mod/resource/type/file/localpath.php b/mod/resource/type/file/localpath.php
index 8fe540dbb3c..e0999632504 100644
--- a/mod/resource/type/file/localpath.php
+++ b/mod/resource/type/file/localpath.php
@@ -39,7 +39,7 @@
     </script>
     
     <br />
-    <div style="text-align:center" class="form">
+    <div class="form mdl-align">
     <form id="myform" action="localpath.php" method="post">
     <fieldset class="invisiblefieldset">
     <input type="hidden" name="sesskey" value="<?php echo sesskey(); ?>">
diff --git a/mod/scorm/report.php b/mod/scorm/report.php
index dce73101963..9a470a292e7 100755
--- a/mod/scorm/report.php
+++ b/mod/scorm/report.php
@@ -217,7 +217,7 @@
                 if ($scoes = get_records_select('scorm_scoes',"scorm='$scorm->id' ORDER BY id")) {
                     if (!empty($userdata)) {
                         print_simple_box_start('center');
-                        echo '<div style="text-align:center">'."\n";
+                        echo '<div class="mdl-align">'."\n";
                         print_user_picture($user, $course->id, $userdata->picture, false, false);
                         echo "<a href=\"$CFG->wwwroot/user/view.php?id=$user&amp;course=$course->id\">".
                              "$userdata->firstname $userdata->lastname</a><br />";
@@ -279,7 +279,7 @@
             print_simple_box_start('center');
             //print_heading(format_string($sco->title));
             print_heading('<a href="'.$CFG->wwwroot.'/mod/scorm/player.php?a='.$scorm->id.'&amp;mode=browse&amp;scoid='.$sco->id.'" target="_new">'.format_string($sco->title).'</a>');
-            echo '<div style="text-align:center">'."\n";
+            echo '<div class="mdl-align">'."\n";
             print_user_picture($user, $course->id, $userdata->picture, false, false);
             echo "<a href=\"$CFG->wwwroot/user/view.php?id=$user&amp;course=$course->id\">".
                  "$userdata->firstname $userdata->lastname</a><br />";
diff --git a/mod/wiki/ewiki/plugins/moodle/downloads.php b/mod/wiki/ewiki/plugins/moodle/downloads.php
index 77188a0f4d9..512ed4d9161 100644
--- a/mod/wiki/ewiki/plugins/moodle/downloads.php
+++ b/mod/wiki/ewiki/plugins/moodle/downloads.php
@@ -216,7 +216,7 @@ function ewiki_page_filedownload($id, $data, $action, $def_sec="") {
                "orderby"=>$orderby, "section" => $sec)) .
                '">' . $title . "</a>";
          }
-         $o .= '<div style="text-align:center" class="darker">'.implode(" &middot; ", $oa).'</div><br />';
+         $o .= '<div class="mdl-align darker">'.implode(" &middot; ", $oa).'</div><br />';
       }
    }
 
diff --git a/search/query.php b/search/query.php
index c0d14ff4699..0e016139019 100644
--- a/search/query.php
+++ b/search/query.php
@@ -271,7 +271,7 @@
     </form>
     <br/>
     
-    <div style="text-align:center">
+    <div class="mdl-align">
     <?php
     print_string('searching', 'search') . ': ';
     
diff --git a/search/querylib.php b/search/querylib.php
index 01baf7db3ae..ac83694fc33 100644
--- a/search/querylib.php
+++ b/search/querylib.php
@@ -315,7 +315,7 @@ class SearchQuery {
       $next   = get_string('next', 'search');
       $back   = get_string('back', 'search');
 
-      $ret = "<div style='text-align:center' id='search_page_links'>";
+      $ret = "<div class='mdl-align' id='search_page_links'>";
 
       //Back is disabled if we're on page 1
       if ($page > 1) {