diff --git a/wwwroot/css/site.css b/wwwroot/css/site.css
index 96bdc95..6b0f993 100644
--- a/wwwroot/css/site.css
+++ b/wwwroot/css/site.css
@@ -96,8 +96,9 @@ button {
     margin: 20px auto;
     font-size: 20px;
     padding: 8px;
-    border: 1px solid #fff;
-    border-radius: 4px;
+    border: 1px solid #333;
+    border-radius: 8px;
+    box-sizing: border-box;
 }
 
 form input[type=password] {