body {
         font-family: sans-serif;
}

.screen {
        font-family: monospace;
        font-size: 1em;
        display: block;
        padding: 10px;
        border: 1px solid #bbb;
        background-color: #eee;
        color: #000;   
        overflow: auto;
        border-radius: 2.5px;
        -moz-border-radius: 2.5px;
        margin: 0.5em 2em;
 
}

.programlisting {
        font-family: monospace;
        font-size: 1em;
        display: block;
        padding: 10px;
        border: 1px solid #bbb;
        background-color: #ddd;
        color: #000;   
        overflow: auto;
        border-radius: 2.5px;
        -moz-border-radius: 2.5px;
        margin: 0.5em 2em;
}

h1 {
    font-size:162%;
}

h2 {
    font-size:140%;
}

h3 {
    font-size:120%;
}

h4 {
    font-size:110%;
}

h5 {
    font-size:105%;
}

h6 {
    font-size:100%;
}

th, td, table {
    border: thin solid blue !important;
}

td, th {
  padding: 0.5em;
}