Bootstrap 4 input error

<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">

<!--
  Title: bootstrap 4 input error
-->
<!--Go to https://www.w3schools.com/bootstrap4/bootstrap_forms.asp for more info-->
<form action="/action_page.php" class="was-validated">
  <div class="form-group">
    <label for="uname">Username:</label>
    <input type="text" class="form-control" id="uname" placeholder="Enter username" name="uname" required>
    <div class="valid-feedback">Valid.</div>
    <div class="invalid-feedback">Please fill out this field.</div>
  </div>
  <div class="form-group">
    <label for="pwd">Password:</label>
    <input type="password" class="form-control" id="pwd" placeholder="Enter password" name="pswd" required>
    <div class="valid-feedback">Valid.</div>
    <div class="invalid-feedback">Please fill out this field.</div>
  </div>
  <div class="form-group form-check">
    <label class="form-check-label">
      <input class="form-check-input" type="checkbox" name="remember" required> I agree on blabla.
      <div class="valid-feedback">Valid.</div>
      <div class="invalid-feedback">Check this checkbox to continue.</div>
    </label>
  </div>
  <button type="submit" class="btn btn-primary">Submit</button>
</form>

Source: stackoverflow.com

Similar codes

0 vote141 views1 answer
How to override bootstrap css in wordpress
CSS Bootstrap
0 vote137 views1 answer
Javascript test login password in bootstrap studio
Javascript Bootstrap
16 votes148 views2 answers
Toggle bootstrap modal with jquery
Javascript Bootstrap
0 vote140 views1 answer
React bootstrap button
Javascript Bootstrap
4 votes138 views2 answers
Bootstrap icons sdn
CSS Bootstrap
1 vote143 views1 answer
Bootstrap word-wrap: break-word;
CSS Bootstrap
2 votes143 views1 answer
Can't import react bootstrap
Javascript Bootstrap
0 vote151 views1 answer
Bootstrap off canvas not working
Javascript Bootstrap
0 vote142 views1 answer
Bootstrap 3 dropdown don't close on click
Javascript Bootstrap
1 vote143 views1 answer
Change order columns bootstrap
CSS Bootstrap