diff --git a/browser/css/jsdialogs.css b/browser/css/jsdialogs.css
index 95e55de16f..e108eed4cf 100644
--- a/browser/css/jsdialogs.css
+++ b/browser/css/jsdialogs.css
@@ -955,6 +955,9 @@ input[type='number']:hover::-webkit-outer-spin-button {
 	background-color: var(--color-background-dark);
 	border: 1px solid var(--color-border-dark);
 	border-radius: var(--border-radius);
+	vertical-align: top;
+	width: -webkit-fill-available;
+	width: -moz-available;
 }
 
 /* buttons: btns.css */