Add possibility of closing popups

src/components/Popup.js

@@ -22,9 +22,13 @@ class Popup extends Component {
     
     render() {
         return (
-            <div className={`${this.state.visible ? "visible" : ""}` + " popup"}>
+            <>
+                <div className={`${this.state.visible ? "" : "hidden"}` + " popupClose"} onClick={this.hide} />
+                
+                <div className={`${this.state.visible ? "visible" : ""}` + " popup " + this.props.className}>
                     {this.props.children}
                 </div>
+            </>
         );
     }
 }