diff --git a/assets/css/app.scss b/assets/css/app.scss
index b0912f7..d6394db 100644
--- a/assets/css/app.scss
+++ b/assets/css/app.scss
@@ -32,7 +32,7 @@ $base-font-size: 16px;
 $black-square-color: #777;
 $white-square-color: #bbb;
 
-$selected-square-color: #0099ff;
+$selected-square-color: #66ff00;
 
 $square-outline-color: darken($black-square-color, 20%);
 $selected-outline-color: lighten($selected-square-color, 20%);