diff -u b/core/themes/bartik/css/components/form.css b/core/themes/bartik/css/components/form.css
--- b/core/themes/bartik/css/components/form.css
+++ b/core/themes/bartik/css/components/form.css
@@ -284,7 +284,7 @@
   color: #e32700;
 }
 
-@media screen and (max-width: 25em) {
+@media screen and (max-width: 600px) {
   form input:not([type="checkbox"]) {
     width: 100%;
   }
diff -u b/core/themes/bartik/css/components/search-form.css b/core/themes/bartik/css/components/search-form.css
--- b/core/themes/bartik/css/components/search-form.css
+++ b/core/themes/bartik/css/components/search-form.css
@@ -39,7 +39,7 @@
   display: block;
 }
 
-@media screen and (max-width: 25em) {
+@media screen and (max-width: 600px) {
   .search-form .form-search {
     margin: 2px 0;
     padding: 4px;