diff --git a/src/Block/Sidebar.jsx b/src/Block/Sidebar.jsx
index 9de495a..e19ee05 100644
--- a/src/Block/Sidebar.jsx
+++ b/src/Block/Sidebar.jsx
@@ -80,7 +80,7 @@ const Sidebar = ({ data, block, onChangeBlock }) => {
         <h2>{intl.formatMessage(messages.comuniChiamo)}</h2>
       </header>
 
-      <Segment className="ui form">
+      <Segment className="ui form comuni-chiamo-addon">
         <TextWidget
           id="title"
           title={intl.formatMessage(messages.title)}
diff --git a/src/Block/sidebar.css b/src/Block/sidebar.css
index e6d0344..0f8cfa4 100644
--- a/src/Block/sidebar.css
+++ b/src/Block/sidebar.css
@@ -3,7 +3,7 @@
   margin-bottom: 1rem;
 }
 
-body.cms-ui .color-list-widget .ui.button {
+body.cms-ui .comuni-chiamo-addon .color-list-widget .ui.button {
   border-width: 2px;
   border-color: #fff;
 }