<html>
<meta name="viewport" content="width=device-width,initial-scale=1.0">
<head><title>Day 3</title>
<style>
.k
{
padding: 30px;
margin:19px;
background-color: black;
color: white;
height: 45px;
text-align: center;
}
</style></head>
<body>
<div class="k">
Hello world
</div>
<span style="background-color:seagreen;color:yellow;font-family: cursive">hey</span>
</body>
</html>