<div class="alert alert--error">
  <span class="alert__msg msg--error">This is a error message</span>
</div>

<div class="alert alert--warning">
  <span class="alert__msg msg--alert">This is a warning message</span>
</div>

<div class="alert alert--info">
  <span class="alert__msg msg--info">This is a info message</span>
</div>

<div class="alert alert--success">
  <span class="alert__msg msg--success">This is a success message</span>
</div>