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Bootstrap white space between boxes

I'm new on bootstrap trying to improve my skills, i just got stuck, i have 6 boxes, three left side and three right side, my question is why there is space between box number '4' and '5' when i'm on 'sm, md,lg' sizes ? how can i put box number 5 under box number 4 without blank space ? and is there away to take away those 'white space' and still make this work like this ?

 <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css"> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"></script> <style> .box{ width:30%; height:250px; border: solid black 1px; } .boxx{ width:100px; height:100px; border: solid white 1px; } .bo{ width:50%; height:550px; border: solid black 1px; } * { box-sizing: border-box; box-sizing: border-box; -webkit-box-sizing -moz-box-sizing: border-box; } </style> </head> <body> <body> <div class="row"> <div class="col-lg-6 col-md-6 col-sm-6 col-xs-12"> <div class="boxx mx-auto"> white space </div> </div> <div class="col-lg-6 col-md-6 col-sm-6 col-xs-12"> <div class="box mx-auto"> 2 </div> </div> <div class="col-lg-6 col-md-6 col-sm-6 col-xs-12"> <div class="bo mx-auto"> 3 </div> </div> <div class="col-lg-6 col-md-6 col-sm-6 col-xs-12"> <div class="box mx-auto"> 4 </div> </div> <div class="col-lg-6 col-md-6 col-sm-6 col-xs-12"> <div class="boxx mx-auto"> white space </div> </div> <div class="col-lg-6 col-md-6 col-sm-6 col-xs-12"> <div class="box mx-auto"> 5 </div> </div> </div> </body> </html> </body> </html>

 <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css"> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"></script> <style> .box{ width:30%; height:250px; border: solid black 1px; } .bo{ width:50%; height:550px; border: solid black 1px; } * { box-sizing: border-box; box-sizing: border-box; -webkit-box-sizing -moz-box-sizing: border-box; } </style> </head> <body> <div class="row"> <div class="col-md-6"> </div> <div class="col-md-6"> <div class="box mx-auto"> 2 </div> </div> <div class="col-md-6"> <div class="bo mx-auto"> 3 </div> </div> <div class="col-md-6"> <div class="box mx-auto"> 4 </div> <div class="box mx-auto"> 5 </div> </div> </div> </body> </html>

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