diff --git a/admin/tool/behat/renderer.php b/admin/tool/behat/renderer.php
index 9bcda1ff6d6..bf2b7a10a62 100644
--- a/admin/tool/behat/renderer.php
+++ b/admin/tool/behat/renderer.php
@@ -139,7 +139,7 @@ class tool_behat_renderer extends plugin_renderer_base {
         $msg = get_string('wrongbehatsetup', 'tool_behat', $a);
 
         // Error box including generic error string + specific error msg.
-        $html .= $this->output->box_start('box errorbox');
+        $html .= $this->output->box_start('box errorbox alert alert-danger');
         $html .= html_writer::tag('div', $msg);
         $html .= $this->output->box_end();
 
diff --git a/lib/outputrenderers.php b/lib/outputrenderers.php
index 6a5800d6eac..b088e095874 100644
--- a/lib/outputrenderers.php
+++ b/lib/outputrenderers.php
@@ -2797,7 +2797,7 @@ EOD;
             $message .= '<p class="errormessage">' . get_string('installproblem', 'error') . '</p>';
             //It is usually not possible to recover from errors triggered during installation, you may need to create a new database or use a different database prefix for new installation.
         }
-        $output .= $this->box($message, 'errorbox', null, array('data-rel' => 'fatalerror'));
+        $output .= $this->box($message, 'errorbox alert alert-danger', null, array('data-rel' => 'fatalerror'));
 
         if ($CFG->debugdeveloper) {
             if (!empty($debuginfo)) {