diff --git a/style/web/components/collapse/_index.less b/style/web/components/collapse/_index.less
index 566f4cf7cf..9196aa155f 100644
--- a/style/web/components/collapse/_index.less
+++ b/style/web/components/collapse/_index.less
@@ -91,6 +91,10 @@
         cursor: pointer;
       }
 
+      &-content {
+        width: 100%;
+      }
+
       &-left,
       &-right,
       &-right-content {