Here is a DreamHost disclaimer that is written in CSS:
div.post div.entry div.disclaimer {
width:95%;
font-size:1em;
background-color:#ffeeee;
border:1px solid #990000;
padding:1.5em;
margin:1em 0;
}
<div class="disclaimer">As a standard disclaimer, if youíre not familiar with the Unix shell, I <strong>highly suggest</strong> you not try this unless under the supervision of someone who reads Perl books for fun. By accessing your Dreamhost shell, you can seriously f-up your account and I will not fix it for you. You have been warned.</div> 
