diff --git a/styles/all/theme/phpbbads.css b/styles/all/theme/phpbbads.css
index b135e37..7864f6c 100644
--- a/styles/all/theme/phpbbads.css
+++ b/styles/all/theme/phpbbads.css
@@ -1,7 +1,18 @@
 .phpbb-ads {
+	overflow: hidden;
 	margin: 10px 0;
 }
 
+.phpbb-ads img {
+	max-width: 100%;
+	height: auto;
+}
+
+.phpbb-ads iframe,
+.phpbb-ads video {
+	max-width: 100%;
+}
+
 .phpbb-ads-center {
 	text-align: center;
 }