diff --git a/packages/theme-chalk/src/message-box.scss b/packages/theme-chalk/src/message-box.scss
index a50b8aa420..884b129ceb 100644
--- a/packages/theme-chalk/src/message-box.scss
+++ b/packages/theme-chalk/src/message-box.scss
@@ -144,6 +144,7 @@
 
   @include e(message) {
     margin: 0;
+    min-width: 0;
 
     & p {
       margin: 0;