html, body
{
    height: 100%;
    width: 100%;
    margin: 0;
    padding: 0;
}

body
{
    color: #ffffff;
    background-color: #000000;
}

.container
{
    height: 100%;
    padding: 0;
    margin: 0;
    display: -webkit-box;
    display: -moz-box;
    display: -ms-flexbox;
    display: -webkit-flex;
    display: flex;
    align-items: center;
    justify-content: center;
}

#cnv
{
    position: absolute;
    top: 0;
    left: 0;
    z-index: -1;
    display: block;
}