#header{
    margin-top: 50px;
    margin-bottom: 50px;
    text-align: center;
    width: 100%;
    font-size: 50px;
    color: #666
}
#copyright{
	margin-bottom: 10px;
	text-align: center;
	width:100%;
	color:#666;
}

#copyright a{
	color:#666;
}

#canvas_div{
    align-content: center;
}

#main_canvas{
    width: 100%;
    align-content: center;
}