diff --git a/css/base.css b/css/base.css
index 1bc632a..5547ad7 100644
--- a/css/base.css
+++ b/css/base.css
@@ -307,6 +307,7 @@ button,
   position: relative;
   cursor: pointer;
   border: 0;
+  border-radius: 4px;
   padding: 8px 10px;
   line-height: 1.6;