diff --git a/packages/bot-engine/src/assets/phone.css b/packages/bot-engine/src/assets/phone.css
index 0f8270401..cf388cf15 100644
--- a/packages/bot-engine/src/assets/phone.css
+++ b/packages/bot-engine/src/assets/phone.css
@@ -2,6 +2,8 @@
   padding: 1rem 0.5rem;
   outline: none !important;
   background: transparent;
+  flex: 1 1 0%;
+  width: 100%;
 }
 
 .PhoneInputCountry {