JSFiddle - React, Tailwind, and code Playground

HTML

<div class="alert-box error"><span>error: </span>Write your error message here.</div>
<div class="alert-box success"><span>success: </span>Write your success message here.</div>
<div class="alert-box warning"><span>warning: </span>Write your warning message here.</div>
<div class="alert-box notice"><span>notice: </span>Write your notice message here.</div>

CSS

.alert-box {
    color:#555;
    border-radius:10px;
    font-family:Tahoma, Geneva, Arial, sans-serif;
    font-size:11px;
    padding:10px 36px;
    margin:10px;
}
.alert-box span {
    font-weight:bold;
    text-transform:uppercase;
}
.error {
    background:#ffecec url('http://i.imgur.com/uI9zdLt.png') no-repeat 10px 50%;
    border:1px solid #f5aca6;
}
.success {
    background:#e9ffd9 url('http://i.imgur.com/Z2dChip.png') no-repeat 10px 50%;
    border:1px solid #a6ca8a;
}
.warning {
    background:#fff8c4 url('http://i.imgur.com/EfdEAUr.png') no-repeat 10px 50%;
    border:1px solid #f2c779;
}
.notice {
    background:#e3f7fc url('http://i.imgur.com/ZcZFYV7.png') no-repeat 10px 50%;
    border:1px solid #8ed9f6;
}

JavaScript

/* Basic Notification Boxes  /
/  Original Author: Unknown  /
/  Modifyed by: Cyan Designs /
/  Created for an Example    /
/  (c) 2013, Csnap.net   */