Fixed custom emotes background color #27745 (#12798)

* Fixed the drag and drop of X ##27186

* Fixed custom emotes background color #27745

* Fixed custom emotes background color #27745

Author: asimdelvi

res/css/views/rooms/_EventTile.pcss

@@ -887,6 +887,10 @@ $left-gutter: 64px;
     &.markdown-body img {
         object-fit: contain;
         object-position: left top;
+
+        /* Override the default colors of the 'github-markdown-css' library 
+        (#fff for light theme, #000 for dark theme) to match the inherited theme */
+        background-color: inherit !important;
     }
 
     .mx_EventTile_clamp & {