diff --git a/styles/style.css b/styles/style.css
index 9004d4c..12599cd 100644
--- a/styles/style.css
+++ b/styles/style.css
@@ -173,6 +173,13 @@ a:hover {
     outline: none;
 }
 
+.markdown-rendered img:not([width]),
+.markdown-rendered audio,
+.markdown-rendered video {
+    max-width: 100%;
+    outline: none;
+}
+
 .markdown-rendered h1,
 .markdown-rendered h2,
 .markdown-rendered h3,