diff --git a/res/css/_components.scss b/res/css/_components.scss
index 8706772ad9..0ba2b609e8 100644
--- a/res/css/_components.scss
+++ b/res/css/_components.scss
@@ -133,6 +133,7 @@
 @import "./views/messages/_MNoticeBody.scss";
 @import "./views/messages/_MStickerBody.scss";
 @import "./views/messages/_MTextBody.scss";
+@import "./views/messages/_MVideoBody.scss";
 @import "./views/messages/_MessageActionBar.scss";
 @import "./views/messages/_MessageTimestamp.scss";
 @import "./views/messages/_MjolnirBody.scss";
diff --git a/res/css/views/messages/_MVideoBody.scss b/res/css/views/messages/_MVideoBody.scss
new file mode 100644
index 0000000000..3b05c53f34
--- /dev/null
+++ b/res/css/views/messages/_MVideoBody.scss
@@ -0,0 +1,22 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+span.mx_MVideoBody {
+    video.mx_MVideoBody {
+        max-width: 100%;
+        height: auto;
+    }
+}