add w-50

src/client/js/components/Admin/SlackIntegration/CustomBotWithProxyIntegrationCard.jsx

@@ -62,7 +62,7 @@ const CustomBotWithProxyIntegrationCard = (props) => {
           </div>
         </div>
         <div className="card-body p-4 mb-5 text-center">
-          <div className="btn-group-vertical">
+          <div className="btn-group-vertical w-50">
             {props.siteNames.map((siteName) => {
               return <button type="button" key={siteName} className="btn btn-primary mb-3">{siteName}</button>;
             })}