<div class="container py-5">
  <div class="row">
    <div class="alert alert-primary text-white font-weight-bold" role="alert">
      A simple primary alert—check it out!
    </div>
    <div class="alert alert-secondary text-white font-weight-bold" role="alert">
      A simple secondary alert—check it out!
    </div>
    <div class="alert alert-success text-white font-weight-bold" role="alert">
      A simple success alert—check it out!
    </div>
    <div class="alert alert-danger text-white font-weight-bold" role="alert">
      A simple danger alert—check it out!
    </div>
    <div class="alert alert-warning text-white font-weight-bold" role="alert">
      A simple warning alert—check it out!
    </div>
    <div class="alert alert-info text-white font-weight-bold" role="alert">
      A simple info alert—check it out!
    </div>
    <div class="alert alert-light text-white font-weight-bold" role="alert">
      A simple light alert—check it out!
    </div>
    <div class="alert alert-dark text-white font-weight-bold" role="alert">
      A simple dark alert—check it out!
    </div>
  </div>
</div>