<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>Coding-Area</title>
</head>
<body>
    <!-- write your code below -->
    <h1>Hello World<hr></h1>


</body>

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

h1{
    border-radius: 5px;
    padding:10px;
    color:white;
    background:red;
}

let msg = "hello";
msg

Console

Output