diff --git a/css/black.css b/css/black.css
index 41af1af..00354d6 100644
--- a/css/black.css
+++ b/css/black.css
@@ -58,7 +58,7 @@ color: black;
 }
 
 .disk {
-  border: 1px solid white;
+  border: 1px solid black;
   width: 150px;
   padding: 0px;
 }
diff --git a/css/blue.css b/css/blue.css
index d65a402..3077200 100644
--- a/css/blue.css
+++ b/css/blue.css
@@ -58,7 +58,7 @@ color: black;
 }
 
 .disk {
-  border: 1px solid white;
+  border: 1px solid black;
   width: 150px;
   padding: 0px;
 }
diff --git a/css/white.css b/css/white.css
index d0b8126..240619f 100644
--- a/css/white.css
+++ b/css/white.css
@@ -58,7 +58,7 @@ color: black;
 }
 
 .disk {
-  border: 1px solid white;
+  border: 1px solid black;
   width: 150px;
   padding: 0px;
 }