puzzle.css

body

{

    padding: 0;

    margin:0px;

    /*

    background-color: whitesmoke ;

    color: midnightblue;

    padding: 0;

    margin:50px;

    text-align:center;

    */

}



canvas

{
 padding-left: 0;
    padding-right: 0;
    margin-left: auto;
    margin-right: auto;
    display: block;
    border:2px solid green;

    box-shadow: 3px 3px 5px gray;

}