Remember, the actual content and structure of your "index.html" file will vary based on the specific requirements and design of your website.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
h1{
position: relative;
}
h1::after{
content: "";
position: absolute;
left: 0;
bottom: 0;
height: 3px;
width: 0%;
background-color: black;
transition: 1s;
}
h1:hover::after{
width: 100%;
}
</style>
</head>
<body>
<div><h1>Hello world!!!</h1></div>
</body>
</html>
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