h1{
color: #fff;
background-color: #60a;
padding: 10px 10px;
}

h2{
border-bottom: 1px solid #60a;
}

pre{
font-family: monospace;
border: 1px solid #ccc;
background-color: #efefef;
padding: 10px;
}

.caution{
border: 3px solid red;
color: red;
font-weight: bold;
background-color: #faa;
padding: 5px;
}