Add css

src/app.js

@@ -1,8 +1,8 @@
 function Card(data) {
     return (
-      <div class="card">
+      <div className="card">
       <h4><b>{data.Username}</b></h4>
-        <div class="container">
+        <div className="container">
           <p>{data.Closed}</p>
           <p>{data.UserID}</p>
         </div>
@@ -27,8 +27,8 @@ class Verification extends React.Component {
         return (
            <div className="App">
                <ul>
-                   {this.state.verifications.map((data) => (
-                       <li key={data.UserID}> <Card {...data} /></li>
+                   {this.state.verifications.map((data, i) => (
+                       <li key={i}> <Card {...data} /></li>
                    ))}
                </ul>
            </div>