diff --git a/app/main.css b/app/main.css
index a8ba06e5..abdc23a2 100644
--- a/app/main.css
+++ b/app/main.css
@@ -311,6 +311,7 @@ select {
 }
 
 .signin {
+  backface-visibility: hidden;
   border-radius: 6px;
   transition-property: transform, background-color;
   transition-duration: 250ms;