<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <div class="timer"></div>
</body>
</html>
 body{
      display: flex;
      align-items: center;
      justify-content: center;
      height: 100vh;
    background:linear-gradient(pink,aqua)
    }
    .timer{
    color: white;
font-size:56px;
font-weight: bolder;
border:5px solid white;
padding:50px;
border-radius:50%;
    }
var time=document.getElementsByClassName("timer")
 
 var timings=60;
 var i=0;
     var myInterval = setInterval(Timeout, 1000);
    function Timeout(){
     
        time[0].innerHTML=`${(timings*60-i)%60}`;
         
i++;
    }

External CSS

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External JavaScript

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