Issue #2854111 by abbym, pritish.kumar, mahalingam_cs, trong.nguyen.tcec,...

Issue #2854111 by abbym, pritish.kumar, mahalingam_cs, trong.nguyen.tcec, Manuel Garcia, Cottser: Large images are not responsive, exceed the available space

core/themes/seven/css/base/elements.css

@@ -172,3 +172,7 @@ details summary:focus,
 details summary:hover {
   text-decoration: underline;
 }
+img {
+  max-width: 100%;
+  height: auto;
+}