body 
{
    font: 20px Helvetica;
    background: black;
}

#main 
{
    min-height: 525px;
    margin: 0px;
    padding: 0px;
    display: flex;
    flex-flow: row;
}

#main > article 
{
    margin: 4px;
    padding: 5px;
    border: 1px solid #8888bb;
    border-radius: 7pt;
    background:black;
    color: white;
    flex: 3 1 60%;
    order: 2;
}

#main > nav 
{
    margin: 4px;
    padding: 5px;
    border: 1px solid #8888bb;
    border-radius: 7pt;
    width: 230px;
    order: 1;
    background:black;
    color: white;
}

#main > aside 
{
    margin: 4px;
    padding: 5px;
    border: 1px solid #8888bb;
    border-radius: 7pt;
    background:black;
    color: white;
    width: 225px;
    order: 3;
}

header, footer 
{
    text-align: center;
    display: block;
    margin: 4px;
    padding: 5px;
    min-height: 30px;
    border: 1px solid #8888bb;
    border-radius: 7pt;
    background:black;
    color: white;
}

th
{
    text-align:left;
}

button
{
    font-size: 30px;
    width: 120px;
    margin: 10px;
}

button:hover 
{
    background-color: #8888bb;
}


/* Too narrow to support three columns */
@media all and (max-width: 640px) 
{
    #main, #page 
    {
        flex-direction: column;
    }

    #main > article, #main > nav, #main > aside 
    {
    /* Return them to document order */
        order: 0;
    }

    #main > nav, #main > aside, header, footer
    {
        min-height: 120px;
        max-height: 120px;
    }
}