diff --git a/style.css b/style.css
index b1a4e3b87..ae8f3f764 100644
--- a/style.css
+++ b/style.css
@@ -1,8 +1,11 @@
+:root{
+    --circle-size:500px;
+}
 .blue {
 			background-color:blue
 }
 .circle{
 			border-radius:50%;
-			width:300px;
-			height:300px;
+			width:var(--circle-size);
+			height:var(--circle-size);
 }