body {
    margin: 0px;
}

#container {
    width:100%;
    height:100%;
    text-align:center;
    background-color:rgb(30,30,30);
}

#canvas1 {
    margin-top:20px;
    border:7px dashed grey;
    background-color:rgb(70,70,70);
    cursor:crosshair;
}