diff --git a/lib/portal.js b/lib/portal.js
index 6497991..366e13b 100644
--- a/lib/portal.js
+++ b/lib/portal.js
@@ -122,6 +122,9 @@ export default class Portal extends React.Component {
   renderPortal(props, isOpening) {
     if (!this.node) {
       this.node = document.createElement('div');
+      if(props.className) {
+        this.node.className = props.className;
+      }      
       document.body.appendChild(this.node);
     }
 
@@ -170,6 +173,7 @@ Portal.propTypes = {
   onClose: React.PropTypes.func,
   beforeClose: React.PropTypes.func,
   onUpdate: React.PropTypes.func,
+  className: React.PropTypes.string,
 };
 
 Portal.defaultProps = {