diff --git a/phpBB/adm/style/admin.css b/phpBB/adm/style/admin.css
index 290fee2983..f115a6f72c 100644
--- a/phpBB/adm/style/admin.css
+++ b/phpBB/adm/style/admin.css
@@ -2969,3 +2969,10 @@ fieldset.permissions .permissions-switch {
 /* stylelint-enable selector-no-qualifying-type */
 /* stylelint-enable declaration-property-unit-blacklist */
 /* stylelint-enable declaration-property-unit-whitelist */
+
+.console-output {
+	background-color: #2a2a2a;
+	color: #f1f1f1;
+	font-family: monospace;
+	overflow-x:scroll;
+}
diff --git a/phpBB/adm/style/detailed_message_body.html b/phpBB/adm/style/detailed_message_body.html
index 5fc0b1b2ec..bc904d7eb6 100644
--- a/phpBB/adm/style/detailed_message_body.html
+++ b/phpBB/adm/style/detailed_message_body.html
@@ -5,11 +5,8 @@
 	<p>{{ MESSAGE_TEXT }}</p>
 </div>
 
-<div style="overflow-x:scroll">
-	<fieldset>
-		{%- if MESSAGE_DETAIL_LEGEND -%}
-			<legend>{{ MESSAGE_DETAIL_LEGEND|nl2br }}</legend>
-		{%- endif -%}
+<div>
+	<fieldset class="console-output">
 		<pre>{{ MESSAGE_DETAIL }}</pre>
 	</fieldset>
 </div>
diff --git a/phpBB/includes/acp/acp_extensions.php b/phpBB/includes/acp/acp_extensions.php
index fe0a6184cd..1bcbe9f415 100644
--- a/phpBB/includes/acp/acp_extensions.php
+++ b/phpBB/includes/acp/acp_extensions.php
@@ -453,7 +453,7 @@ class acp_extensions
 					$this->display_composer_exception($language, $e, $composer_io);
 					return;
 				}
-				$this->tpl_name = 'detailled_message_body';
+				$this->tpl_name = 'detailed_message_body';
 
 				$this->template->assign_vars(array(
 						'MESSAGE_TITLE'			=> $language->lang('ACP_EXTENSIONS_INSTALL'),
@@ -492,7 +492,7 @@ class acp_extensions
 					$this->display_composer_exception($language, $e, $composer_io);
 					return;
 				}
-				$this->tpl_name = 'detailled_message_body';
+				$this->tpl_name = 'detailed_message_body';
 
 				$this->template->assign_vars(array(
 						'MESSAGE_TITLE'			=> $language->lang('ACP_EXTENSIONS_REMOVE'),
@@ -531,7 +531,7 @@ class acp_extensions
 					$this->display_composer_exception($language, $e, $composer_io);
 					return;
 				}
-				$this->tpl_name = 'detailled_message_body';
+				$this->tpl_name = 'detailed_message_body';
 
 				$this->template->assign_vars(array(
 						'MESSAGE_TITLE'			=> $language->lang('ACP_EXTENSIONS_UPDATE'),
@@ -570,7 +570,7 @@ class acp_extensions
 					$this->display_composer_exception($language, $e, $composer_io);
 					return;
 				}
-				$this->tpl_name = 'detailled_message_body';
+				$this->tpl_name = 'detailed_message_body';
 
 				$this->template->assign_vars(array(
 						'MESSAGE_TITLE'			=> $language->lang('ACP_EXTENSIONS_MANAGE'),
@@ -689,7 +689,7 @@ class acp_extensions
 	 */
 	private function display_composer_exception(\phpbb\language\language $language, \phpbb\exception\runtime_exception $e, \phpbb\composer\io\web_io $composer_io)
 	{
-		$this->tpl_name = 'detailled_message_body';
+		$this->tpl_name = 'detailed_message_body';
 
 		if ($e->getPrevious())
 		{