html - Border is not working with bootstrap 4 -


i new bootstrap , not sure if doing wrong, can´t class="border border-danger" work. rest other styles work fine. code.

    <html lang="en">      <head>          <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" integrity="sha384-rwoiresju2yc3z8gv/npezwav56rsmlldc3r/azzgrngxqqknkkofvhfqhnuweyj" crossorigin="anonymous">          <script src="https://code.jquery.com/jquery-3.1.1.slim.min.js" integrity="sha384-a7fzj7v+d/sdmmqp/noqwlilvusjfdhw+k9omg/a/eheadgtzns3hpfag6ed950n" crossorigin="anonymous"></script>          <script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/js/tether.min.js" integrity="sha384-dztdapbwprxsa/3eyeeuwrwcy7g5kfbe8ffjk5jaixuyhkkdx6qin1dkwx51bbrb" crossorigin="anonymous"></script>          <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/js/bootstrap.min.js" integrity="sha384-vbwwzlzj8ea9acx4pew3rvhjgjt7zpknpzk+02d9phzyevke+jo0iegizqplforn" crossorigin="anonymous"></script>      </head>      <body class="container">          <div class=" text-center m-2 text-primary">                            <h2 class="h4"> sample data rendering </h2>                  <blockquote class="blockquote bg-warning text-white p-2 border" >lorem ipsum dolor sit amet, consectetur adipiscing elit, sed eiusmod tempor incididunt ut labore et dolore magna aliqua.                   ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.                   duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.                   excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum. - lorem ipsum</blockquote>                          </div>                   <div class=" border border-danger  border">              <p class="text-uppercase w-75" > duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.  </p><br>              <button class="btn btn-primary btn-block"> submit </button>          </div>                </body>  </html>

the output snippet given below. enter image description here

i think using bootstrap4 alpha version. in version border-danger doesn't exist in opinion. use bootstrap4 beta version.


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