diff --git a/phpBB/styles/prosilver/theme/colours.css b/phpBB/styles/prosilver/theme/colours.css
index 96cac04ee1..7e56e06982 100644
--- a/phpBB/styles/prosilver/theme/colours.css
+++ b/phpBB/styles/prosilver/theme/colours.css
@@ -369,7 +369,7 @@ p.post-notice {
 	background-image: none;
 }
 
-/*	colours and backgrounds for mentions.css */
+/* colours and backgrounds for mentions.css */
 
 /* mention dropdown */
 .atwho-view { /* mention-container */
diff --git a/phpBB/styles/prosilver/theme/mentions.css b/phpBB/styles/prosilver/theme/mentions.css
index 291f8ed092..e7f17bc03c 100644
--- a/phpBB/styles/prosilver/theme/mentions.css
+++ b/phpBB/styles/prosilver/theme/mentions.css
@@ -1,5 +1,5 @@
 /* -------------------------------------------------------------- /*
-	$Mentions
+    $Mentions
 /* -------------------------------------------------------------- */
 
 /* stylelint-disable selector-max-compound-selectors */