diff --git a/src/skins/vector/css/matrix-react-sdk/structures/login/_Login.scss b/src/skins/vector/css/matrix-react-sdk/structures/login/_Login.scss
index 94820549e7..805c817a28 100644
--- a/src/skins/vector/css/matrix-react-sdk/structures/login/_Login.scss
+++ b/src/skins/vector/css/matrix-react-sdk/structures/login/_Login.scss
@@ -178,6 +178,7 @@ limitations under the License.
     display: inline-block;
     min-width: 170px;
     align-self: flex-end;
+    flex: 1 1 auto;
 }
 
 .mx_Login_field_group {