diff --git a/client/css/style.css b/client/css/style.css
index c3f0216a..556dda79 100644
--- a/client/css/style.css
+++ b/client/css/style.css
@@ -1449,6 +1449,11 @@ button.collapse-network:first-child:nth-last-child(3) {
 	max-width: 100%;
 }
 
+#chat video {
+	max-width: 640px;
+	max-height: 240px;
+}
+
 /* Do not display an empty div when there are no previews. Useful for example in
 part/quit messages where we don't load previews (adds a blank line otherwise) */
 #chat .preview:empty {
diff --git a/client/views/msg_preview.tpl b/client/views/msg_preview.tpl
index 451b99f0..05cf7680 100644
--- a/client/views/msg_preview.tpl
+++ b/client/views/msg_preview.tpl
@@ -12,7 +12,7 @@
 		</audio>
 	{{/equal}}
 	{{#equal type "video"}}
-		<video width="320" height="240" preload="metadata" controls>
+		<video preload="metadata" controls>
 			<source src="{{link}}" type="{{res}}">
 			Your browser does not support the video element.
 		</video>