diff --git a/framework/core/less/forum/Composer.less b/framework/core/less/forum/Composer.less
index 94b80c7bb..585474585 100644
--- a/framework/core/less/forum/Composer.less
+++ b/framework/core/less/forum/Composer.less
@@ -46,6 +46,7 @@
     }
     input {
       font-size: 16px;
+      width: 500px;
 
       &, &[disabled], &:focus {
         background: none;