Enlarge emoji again (#8509)

* Enlarge emoji again

* Use font variable

Author: robintown

res/css/views/elements/_RichText.scss

@@ -35,3 +35,10 @@
 .mx_Markdown_STRIKETHROUGH {
     text-decoration: line-through;
 }
+
+.mx_Emoji {
+    // Should be 1.8rem for our default message bodies, and scale with the
+    // surrounding text
+    font-size: max($font-18px, 1em);
+    vertical-align: bottom;
+}