<div class="messageBox messageBox--danger">
  This is a danger message.
</div>

<div class="messageBox messageBox--warning">
  This is a warning message.
</div>

<div class="messageBox messageBox--info">
  This is an info message.
</div>

.messageBox {
  font-family: Arial, sans-serif;
  font-weight: bold;
  font-size: 1.5em;
  border: 5px solid currentColor;
  padding: 1em;
  text-align: center;
  margin-bottom: 2em;
  position: relative;
  
  &::before {
    content: "";
    display: block;
    position: absolute;
    width: 3.25em;
    height: 3.25em;
    background-color: currentColor;
    top: 0;
    left: 0;
  }
}

.messageBox--danger {
    color: red;
}

.messageBox--warning {
    color: darkgoldenrod;
}

.messageBox--info {
    color: black;
}