diff --git a/demo/distance.html b/demo/distance.html
index e09d185..9b9d645 100644
--- a/demo/distance.html
+++ b/demo/distance.html
@@ -18,6 +18,9 @@
       fc-geometry {
         background: transparent;
         position: absolute;
+        background-color: rgba(255, 255, 255, 0.1);
+        border-radius: 2px;
+        border: 2px solid rgba(0, 0, 0, 0.5);
       }
 
       distance-field canvas {