Merge pull request #1623 from mattermost/fixed-height-embeds

Fix embeds and add default fixed height

web/sass-files/sass/partials/_post.scss

@@ -750,6 +750,7 @@ body.ios {
 		width: 80%;
 		padding-right: 5px;
 		overflow-x: auto;
+		overflow-y: hidden;
 		&.attachment__body--no_thumb {
 			width: 100%;
 		}
@@ -764,6 +765,7 @@ body.ios {
 		margin: 5px 0;
 		padding: 0;
 		line-height: 16px;
+		height: 22px;
 		font-size: 16px;
 		a {
 			font-size: 16px;