diff --git a/src/components/formatter/collaborator-formatter.js b/src/components/formatter/collaborator-formatter.js
index 12af9ee..f58ab5f 100644
--- a/src/components/formatter/collaborator-formatter.js
+++ b/src/components/formatter/collaborator-formatter.js
@@ -1,9 +1,15 @@
 
 import React, { Component } from 'react';
+import PropTypes from 'prop-types';
 import styles from '../../css/plugin-layout.module.css';
 
 class CollaboratorFormatter extends Component {
 
+  static propTypes = {
+    value: PropTypes.array,
+    collaborators: PropTypes.array,
+  };
+
   getCollaboratorsList = () => {
     let { value, collaborators } = this.props;
     let validCollaborators = [];
@@ -21,7 +27,7 @@ class CollaboratorFormatter extends Component {
       }
     });
     return validCollaborators;
-  }
+  };
 
   render() {
     let collaboratorList = this.getCollaboratorsList();
diff --git a/src/css/select.css b/src/css/select.css
index beae7b3..a7f19a5 100644
--- a/src/css/select.css
+++ b/src/css/select.css
@@ -19,11 +19,10 @@
   cursor: pointer;
 }
 
-.dtable-select .dtable-icon-drop-down {
+.dtable-select .dtable-icon-down3 {
   display: inline-block;
   font-size: 12px;
   color: rgba(116, 116, 116, 1);
-  transform: scale(.8) translateY(2px);
   transition: all .1s;
 }
 
@@ -87,4 +86,4 @@
   line-height: 1;
   font-size: 14px;
   color: #949494;
-}
\ No newline at end of file
+}