<!DOCTYPE html> <html lang="en"> <head> <link rel="stylesheet" type="text/css" href="css/bootstrap.css"/> <meta charset="UTF-8" name="viewport" content="width-device-width, initial-scale=1"/> </head> <body> <nav class="navbar navbar-default"> <div class="container-fluid"> </div> </nav> <div class="col-md-6 well"> <hr style="border-top:1px dotted #ccc;"/> <div class="col-md-8"> <div class="col-md-10 well" style="background-color:#ccc;"> <form name="calculator"> <input type="text" name="result" style="width:100%; height:50px; font-size:30px;"> </form> </div> </div> </div> </body> </html>