<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script> <script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> <!------ Include the above in your HEAD tag ----------> <form class="form-horizontal"> <fieldset> <!-- Form Name --> <legend>Area of Circle</legend> <!-- Text input--> <div class="form-group"> <label class="col-md-4 control-label" for="textinput">Enter radius</label> <div class="col-md-4"> <input id="textinput" name="textinput" type="text" placeholder="2" class="form-control input-md"> </div> </div> <!-- Text input--> <div class="form-group"> <label class="col-md-4 control-label" for="textinput">Area of circle</label> <div class="col-md-4"> <input id="textinput" name="textinput" type="text" placeholder="28.27" class="form-control input-md"> </div> </div> <!-- Text input--> <div class="form-group"> <label class="col-md-4 control-label" for="textinput">Perimeter of circle</label> <div class="col-md-4"> <input id="textinput" name="textinput" type="text" placeholder="18.85" class="form-control input-md"> </div> </div> <!-- Button --> <div class="form-group"> <label class="col-md-4 control-label" for="singlebutton"></label> <div class="col-md-4"> <button id="singlebutton" name="singlebutton" class="btn btn-primary">Button</button> </div> </div> </fieldset> </form>