*{
    -webkit-touch-callout: none; /* iOS Safari */
    -webkit-user-select: none;   /* Chrome/Safari/Opera */
    -khtml-user-select: none;    /* Konqueror */
    -moz-user-select: none;      /* Firefox */
    -ms-user-select: none;       /* Internet Explorer/Edge */
    user-select: none;           /* Non-prefixed version, currently
                                  not supported by any browser */
}
body, html{
    width: 100%;
    height: 100%;
    font: 16px sans-serif;
    overflow: hidden;
    font-family: tahoma,arial,sans-serif;
    background: #00000000 url("back.png") repeat top right;
    animation: scroll-background 5s linear infinite;
}

@keyframes scroll-background {
    from {
      background-position-y: 0px;
    }
    to {
      background-position-y: 256px;
    }
  }
canvas {
    font: 16px sans-serif;
    display: block;
    margin: auto;
    position :absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;

    image-rendering: optimizeSpeed;
    image-rendering: -moz-crisp-edges;
    image-rendering: -webkit-optimize-contrast;
    image-rendering: optimize-contrast;
}