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<html lang="en"><head> <title>Bootstrap Example</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css"> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"></script></head><body><div class="container-fluid"> <h1>Hello World!</h1> <p>Resize the browser window to see the effect.</p> <div class="row"> <div class="col-xs-7 col-sm-6 col-lg-8" style="background-color:red;">.col-xs-7 .col-sm-6 .col-lg-8</div> <div class="col-xs-5 col-sm-6 col-lg-4" style="background-color:lavender;">.col-xs-5 .col-sm-6 .col-lg-4</div> </div> <div class="row"> <div class="col-xs-6 col-sm-8 col-lg-10" style="background-color:lavenderblush;">.col-xs-6 .col-sm-8 .col-lg-10</div> <div class="col-xs-6 col-sm-4 col-lg-2" style="background-color:lightgrey;">.col-xs-6 .col-sm-4 .col-lg-2</div> </div> <div class="row" style="background-color:lightcyan;"> <div class="col-xs-6">.col-xs-6</div> <div class="col-xs-6">.col-xs-6</div> </div></div>