Choose Random Winner: Jquery + CSS3 Andrew Pougher

Choose Random Winner: Jquery + CSS3

HTML

<div class="container">
     <h1 class="lead">Random Winner Thing by Andrew Pougher</h1>
    <button class='choosewinner btn btn-sm btn-danger'>Choose Winner</button>
    <table class="table text-center">
        <thead>
            <tr>
                <th>NAME</th>
                <th>Email</th>
                <th>Competition</th>
            </tr>
        </thead>
        <tbody class="row">
            <tr class="entrant">
                <td>bob</td>
                <td>[email protected]</td>
                <td>Holiday for 2</td>
            </tr>
            <tr class="entrant">
                <td>Suze</td>
                <td>[email protected]</td>
                <td>Holiday for 2</td>
            </tr>
            <tr class="entrant">
                <td>Andrew</td>
                <td>[email protected]</td>
                <td>Holiday for 2</td>
            </tr>
            <tr class="entrant">
                <td>Lizzie</td>
                <td>[email protected]</td>
                <td>Holiday for 2</td>
            </tr>
        </tbody>
        </table>

CSS

.highlight {
    color: £FFF;
    background-color: #C00;
      -webkit-opacity: 0.45;
  -moz-opacity: 0.45;
  opacity: 0.45;
-webkit-transition: all 0.4s ease;
  -moz-transition: all 0.4s ease;
  -ms-transition: all 0.4s ease;
  -o-transition: all 0.4s ease;
  transition: all 0.4s ease;
}
.youwin{font-size:30px;   background-color: #ffa;  -webkit-opacity: 1;
  -moz-opacity: 1;
  opacity: 1}

JavaScript

function highlight() {
    var $divs = $('.entrant').removeClass('highlight');
    var random = Math.floor(Math.random() * $divs.length);
    $divs.eq(random).addClass('highlight');
}


$(".choosewinner").click(function(){
//highlight();
var startTime = new Date().getTime();
var interval = setInterval(function(){
    if(new Date().getTime() - startTime > 5000){
        clearInterval(interval);
        $('.highlight').addClass('youwin');
 return;
    }
highlight();
}, 200); 
});