I found this icon speaker template online and am trying to play with it. I want to display this class after countdown is 0 but it doesn't show up. Where did I do wrong?
<body>
    <div class="cover">
        <span class="icon speaker" style=display:none></span>
    </div>
    <div id="countDownTimer" style=display:none></div>
</body>
<script>
var count = 120;
playInterval = setInterval(function(){
            var now = new Date().getTime();
            count = count - 1;
            if(count > 0){
                document.getElementById("countDownTimer").innerHTML = Math.floor(count/10) + " seconds before the first question!";
            }
            if(count == 0 || count <= 0){
                document.getElementsByClassName("cover").style = "display:block";
                //$(".icon speaker").show();
            }
      }, 100);
}
</script>
