body
{
    font: 1em Verdana, Geneva, sans-serif;
    color: WhiteSmoke;
    padding: 0;
    margin: 5px;
    background-color: #003;
}
div
{
    padding: 0;
    margin: 0;
}
button
{
    cursor: pointer;
}
.hidden
{
    display: none;
}


/****************************************************************************/
/* App */
/****************************************************************************/
 #app
{
    position: relative;
    margin: 4px;
    background-color: #bbc;
}

#app header
{
    margin: 0;
    padding: 0 0.5em;
    font-size: 1.5em;
    background-color: #006;
}

#app footer
{
    padding: 8px;
}

#main
{
    position: relative;
    margin-bottom: 4px;
    color: black;
}