Fix screencast videos no margin

Author: distantnative

assets/css/site/screencast.css

@@ -14,6 +14,10 @@
 	text-decoration: none;
 }
 
+.screencast figure.video {
+	margin-block: 0;
+}
+
 @media screen and (min-width: 60rem) {
 	.screencast:not(.reference-content .screencast) {
 		grid-template-columns: 1fr 2fr;