diff --git a/core/themes/seven/css/base/elements.css b/core/themes/seven/css/base/elements.css
index 6644cea..51f19f0 100644
--- a/core/themes/seven/css/base/elements.css
+++ b/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;
+}