add .slack-work-space-name-card

src/client/styles/scss/_admin.scss

@@ -130,6 +130,10 @@
       border: 13px solid;
       border-radius: 50%;
     }
+    .slack-work-space-name-card {
+      background-color: #fff5ff;
+      border: 1px solid #efc1f6;
+    }
   }
 
   //// TODO: migrate to Bootstrap 4