ISTWCMS-4773: adding css for image alignment

css/uw_theme_admin.css

@@ -35,3 +35,16 @@
   width: 6rem;
 }
 
+.uw-media.align-center {
+  display: block;
+  margin-right: auto;
+  margin-left: auto;
+}
+
+.uw-media.align-right {
+  float: right;
+}
+
+.uw-media.align-left {
+  float: right;
+}