diff --git a/source/components/style/property.css b/source/components/style/property.css
index 2b298fe2378d5f8128555c62158b87d8636e04fc..fe4bd1856fc4cbbd141f40e6228b03c5da392a8b 100644
--- a/source/components/style/property.css
+++ b/source/components/style/property.css
@@ -290,6 +290,7 @@
 	--monster-border-style: solid;
 	--monster-border-width: 3px;
 	--monster-border-radius: 0;
+	--monster-outline-width: 1px;
 	--monster-popper-witharrrow-distance: -4px;
 	--monster-z-index-default: 0;
 	--monster-z-index-outline: 10;