/* body,
html,
canvas {
    width: 100%;
    height: 100%;
     leave it to hide the scrollbars 

}  
*/

html {
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-image: linear-gradient(#eee, #aaa);
    height: 100%;
}

body {
    /*  */
    display: flex;
    max-height: 100%;
    max-width: 100%;
}

canvas {
    background-color: #ddc;
    border: solid 5vmin #eee;
    border-bottom-color: #fff;
    border-left-color: #eee;
    border-radius: 2px;
    border-right-color: #eee;
    border-top-color: #ddd;
    box-shadow: 0 0 5px 0 rgba(0, 0, 0, .25) inset, 0 5px 10px 5px rgba(0, 0, 0, .25);
    display: inline-block;
    margin: 10vh 10vw;
    height: 80vh;
    padding: 8vmin;
    position: absolute;
    text-align: center;
}

canvas:before {
    border-radius: 2px;
    bottom: -2vmin;
    box-shadow: 0 2px 5px 0 rgba(0, 0, 0, .25) inset;
    content: "";
    left: -2vmin;
    position: absolute;
    right: -2vmin;
    top: -2vmin;
}

canvas:after {
    border-radius: 2px;
    bottom: -2.5vmin;
    box-shadow: 0 2px 5px 0 rgba(0, 0, 0, .25);
    content: "";
    left: -2.5vmin;
    position: absolute;
    right: -2.5vmin;
    top: -2.5vmin;
}