diff --git a/ghost/core/core/frontend/src/cards/css/signup.css b/ghost/core/core/frontend/src/cards/css/signup.css
index ada4bf1e05..c625c9316a 100644
--- a/ghost/core/core/frontend/src/cards/css/signup.css
+++ b/ghost/core/core/frontend/src/cards/css/signup.css
@@ -210,6 +210,7 @@
     margin-right: 3px;
     padding: 12px 16px;
     border: none;
+    background: #FFFFFF;
     font-size: 1.1em;
 }