Alert

<div class="env-alert env-alert--success" role="alert">
   <strong>Hello!</strong> this is successful alert
   <button
      type="button"
      class="env-alert__close"
      data-dismiss="alert"
      aria-label="Close"
   >
      &times;
   </button>
</div>
<div class="env-alert env-alert--warning" role="alert">
   <strong>Hello!</strong> this is warning alert
</div>
<div class="env-alert env-alert--danger" role="alert">
   <strong>Hello!</strong> this is danger alert
</div>
<div class="env-alert env-alert--info" role="alert">
   <strong>Hello!</strong> this is info alert
</div>