<!DOCTYPE html>
<html>
  <head>
    <title>Hello World!</title>
    <link rel="stylesheet" href="styles.css" />
  </head>
  <body>
      
      
      <div></div>
      <script src="script.js"></script>
  </body>
</html>

index.html

body{
  padding: 25px;
}
.title {
	color: #5C6AC4;
}
div{

height:100px;
width:100px;
background-color:blue;
border:solid 20px red;
margin :30px;
padding:10px;
box-sizing:border-box

}

styles.css

function showTime() {
	document.getElementById('currentTime').innerHTML = new Date().toUTCString();
}
showTime();
setInterval(function () {
	showTime();
}, 1000);