diff --git a/webroot/styles/layout.css b/webroot/styles/layout.css
index 2a8f5ccf6..455796b02 100644
--- a/webroot/styles/layout.css
+++ b/webroot/styles/layout.css
@@ -611,3 +611,9 @@ h2 {
 .extra-user-content table td {
   padding: 0.5em 1em;
   border: 1px solid #CCC; }
+
+.message-text iframe {
+  width: 100%;
+  height: 170px;
+  border-radius: 15px;
+}
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