diff --git a/stylesheets/_conversation.scss b/stylesheets/_conversation.scss
index 31a5a13a..48cca959 100644
--- a/stylesheets/_conversation.scss
+++ b/stylesheets/_conversation.scss
@@ -181,6 +181,10 @@
     img, audio, video {
       max-width: 100%;
     }
+
+    video {
+      background: black;
+    }
   }
 
   .outgoing img.avatar {
diff --git a/stylesheets/manifest.css b/stylesheets/manifest.css
index dcb31309..bcce7cb8 100644
--- a/stylesheets/manifest.css
+++ b/stylesheets/manifest.css
@@ -417,6 +417,9 @@ input.new-message {
   .message-list .attachments audio,
   .message-list .attachments video {
     max-width: 100%; }
+  .message-detail .attachments video,
+  .message-list .attachments video {
+    background: black; }
   .message-detail .outgoing img.avatar,
   .message-list .outgoing img.avatar {
     display: none; }