ind.html

<!DOCTYPE html>
<html lang="en" dir="ltr">
  <head>
    <meta charset="utf-8">
    <title></title>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css" integrity="sha384-JcKb8q3iqJ61gNV9KGb8thSsNjpSL0n8PARn9HuZOnIxN0hoP+VmmDGMN5t9UJ0Z" crossorigin="anonymous">
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<link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap-theme.min.css">


</head>
  <body>

     <h1 style="text-align:center" class="text-uppercase">Lab</h1>

     <h2 style="text-align:center" class="text-lowercase">Responsive Background</h2>
<img src="http://1.bp.blogspot.com/-B0xLq0rkSPE/UtkMTmVKtXI/AAAAAAAABN0/yMO0AMRyaGc/s1600/KTM+RC390.jpg" class="img-fluid" alt="Responsive image">
</body>
</html>