Hello, I am trying to finish the border around the button of btn-primary and after click it shows light blue border adjusting outline:0 but it is useless. How can I remove the border from this button.
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-eOJMYsd53ii+scO/bJGFsiCZc+5NDVN2yr8+0RDqr0Ql0h+rP48ckxlpbzKgwra6" crossorigin="anonymous">
  <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta3/dist/js/bootstrap.bundle.min.js" integrity="sha384-JEW9xMcG8R+pH31jmWH6WWP0WintQrMb4s7ZOdauHnUtxwoG2vI5DkLtS3qm9Ekf" crossorigin="anonymous"></script>
  <title>Document</title>
  <style>
    * {
      box-sizing: border-box;
    }
    
    .container {
      max-width: 520px;
      max-height: 180px;
      background-color: antiquewhite;
    }
    
    fieldset {
      max-width: 518px;
      max-height: 178px;
      padding-right: 15px;
      padding-left: 15px;
    }
    .btn{
        font-weight:600;
        color:#fff;
        text-align:center;
        vertical-align:middle;
        border:1px solid transparent;
        font-size:1.2rem;
        line-height:1.5;
    }
    .btn-primary {
  color: #fff;
  background-color: #1172f4;
  border-color: #000000;
}
.btn-primary: hover {
  color: #fff;
  background-color:#1172f4;
  border-color: black;
}
.btn-primary: focus, .btn-primary. Focus {
  color: #fff;
  background-color:#1172f4;
  border-color: #1875f6;
  box-shadow: 0 0 0 0.2rem rgba(38, 38, 38, 0.5);
}
.btn: focus, .btn. Focus {
  outline: 0;
}
button: focus{
    outline:0;
}
    /*.form-group{
        max-width:518px;
        
    }*/
  </style>
</head>
<body>
  <div class="container">
    <div class="row">
      <div class="col-sm-6 col-sm-offset-3 form-box">
        <form role="form" action method="post" class="registration-form" style="width:482px;height:175px;background-color:aqua;margin-left:5px;margin-right:5px;padding-left: 20px;padding-right: 20px;">
          <fieldset>
            <!--Start 2nd form field set-->
            <div class="form-bottom">
              <div class="form-group" style="margin-top:20px;width:100%;">
                <input type="text" name="form-email" placeholder="Enter Your email" class="form-email form-control" id="form-email">
              </div>
              <!--End of 2nd form groupdiv-->
              <button type="button" class="btn btn-primary btn-next" style="margin-top:20px;margin-bottom:20px;padding-right:15px;width:100%;">Get Started</button>
            </div>
            <!--End of bottom div-->
          </fieldset>
          <!--End of second form fieldset-->
        </form>
</body>
</html>
My container and elements are also not showing the responsive behavior. Please help me to fix both issues. Which property in bootstrap btn-primary button handle these both borders.

