canvas, .preview {
    border: 2px;
    border-color: black;
    border-style: solid;
    width: 800px;
    height: 480px;
}

div.table {
    display: table;
    width: 100%;
}

div.lefthalf, div.righthalf {
    display: table-cell;
    width: 50%;
}

div.about{
    width: 66%;
}