apply link size 1rem

src/client/styles/scss/_admin.scss

@@ -90,9 +90,6 @@ $slack-work-space-name-card-border: #efc1f6;
   Slack Integration
   */
   .selecting-bot-type {
-    .btn-link {
-      font-size: 1rem;
-    }
     .supplementary-bot-name {
       font-size: 1rem;
     }
@@ -118,6 +115,14 @@ $slack-work-space-name-card-border: #efc1f6;
     }
   }
 
+  .admin-slack-integration {
+    .admin-setting-header {
+      .btn-link {
+        font-size: 1rem;
+      }
+    }
+  }
+
   .bot-integration {
     .admin-bot-card {
       border-radius: 8px !important;