diff --git a/data/theme/Adwaita.css b/data/theme/Adwaita.css
index 7f7bd8d4..6c93756b 100644
--- a/data/theme/Adwaita.css
+++ b/data/theme/Adwaita.css
@@ -421,11 +421,11 @@ weekgrid:selected,
  */
 
 monthcell {
-	border: solid 1px alpha(@borders, 0.3);
-	border-width: 1px 0 0 1px;
-	background: transparent;
-	padding: 1px 0 1px 0;
-	transition: background-color 200ms;
+    border: solid 1px alpha(@borders, 0.3);
+    border-width: 1px 0 0 1px;
+    background: transparent;
+    padding: 1px 0 1px 0;
+    transition: background-color 200ms;
 }
 
 monthcell:selected { background-color: alpha(@theme_selected_bg_color, 0.1); }