diff --git a/core/themes/stark/css/layout.css b/core/themes/stark/css/layout.css
index cb8e56100b8b..a31a7740ff9d 100644
--- a/core/themes/stark/css/layout.css
+++ b/core/themes/stark/css/layout.css
@@ -20,6 +20,11 @@
   position: relative;
 }
 
+img {
+  height: auto;
+  max-width: 100%;
+}
+
 @media all and (min-width: 480px) and (max-width: 959px) {
   #content {
     width: 100%;