add class in alert_siteurl

src/client/styles/scss/_layout_growi.scss

@@ -4,6 +4,8 @@
   .content-main {
     padding: 0;
   }
+  .not-site-url {
+  }
 
   .top-of-table-contents {
     line-height: 1.25;

src/server/views/widget/alert_siteurl_undefined.html

@@ -1,5 +1,5 @@
 {% if !getConfig('crowi', 'app:siteUrl') %}
-<div class="alert alert-danger mb-0 px-4 py-2">
+<div class="not-site-url alert alert-danger mb-0 px-4 py-2">
   <i class="icon-exclamation"></i>
   {{ t("security_setting.alert_siteUrl_is_not_set", { link:t('App Settings')}) }}
 </div>