body {
    margin: 20px;
}

pre{
    margin: 20px;
    background-color: #DDDDDD;
    padding: 10px;
    border: dotted 2px;
}
code {
    background-color: #DDDDDD;
    padding-left: 3px;
    padding-right: 3px;
} 
h2,h3,.toc {
    padding: 5px;
    background-color: #EEEEFF;
    border: solid 1px; 
}
a:hover, a:focus {
    background-color: #5500FF;
    color: #FFFFFF;
    text-decoration: none;
}