diff --git a/app/assets/stylesheets/kluk.css b/app/assets/stylesheets/kluk.css
index 3f991a5..1e5cc09 100644
--- a/app/assets/stylesheets/kluk.css
+++ b/app/assets/stylesheets/kluk.css
@@ -55,7 +55,8 @@ main {
 }
 
 .selected-day {
-  border: 2px double white;
+  border-radius: 50%;
+  box-shadow: 0 0 0 3px white, 0 0 0 5px black;
   margin: 4px;
   width: 15px;
   height: 15px;