diff --git a/app/static/styles.css b/app/static/styles.css
index 90765532..820c55c5 100644
--- a/app/static/styles.css
+++ b/app/static/styles.css
@@ -1595,6 +1595,11 @@ h1 .warning_badge {
   right: 0;
 }
 
+.form-control-file {
+  width: 100%;
+  overflow: hidden;
+}
+
 #post_reply_markdown_editor_enabler {
   display: none;
   position: absolute;
diff --git a/app/static/styles.scss b/app/static/styles.scss
index 875c57a6..ea128ba1 100644
--- a/app/static/styles.scss
+++ b/app/static/styles.scss
@@ -1258,6 +1258,11 @@ h1 .warning_badge {
   }
 }
 
+.form-control-file {
+  width: 100%;
+  overflow: hidden;
+}
+
 #post_reply_markdown_editor_enabler {
   display: none;
   position: absolute;