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<!DOCTYPE html> <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="/lib/bootstrap.min.css"> <script src="/lib/jquery-1.12.2.min.js"></script> <script src="/lib/bootstrap.min.js"></script> </head> <body> <div class="container-fluid"> <h1>Hello World!</h1> <div class="row"> <div class="col-xs-6 col-sm-3" style="background-color:lavender;"> Column 1<br> Resize the browser window to see the effect. Also try to remove the div clearfix line and see what happens. </div> <div class="col-xs-6 col-sm-3" style="background-color:lavenderblush;">Column 2</div> <!-- Add clearfix for only the required viewport --> <div class="clearfix visible-xs"></div> <div class="col-xs-6 col-sm-3" style="background-color:lightcyan;">Column 3</div> <div class="col-xs-6 col-sm-3" style="background-color:lightgray;">Column 4</div> </div> </div> </body> </html>