#crt {
    background-image: url('pixel.apng');
    background-size: 2px 1px;
    background-color: white;
    background-blend-mode: hard-light;  /* <- Helps combat the 'darkening' effect from multiply.  */
    mix-blend-mode: multiply;
    pointer-events: none;
    opacity: 0.4;
}

/*
    Stretches DIV to edges of screen.
*/
#crt   {
    position: fixed; 
    width: 100%; 
    top: 0; 
    bottom: 0; 
    right: 0; 
    left: 0;
    z-index: 9999;
}

/*
    Decided to leave this in as a usable class, 
    since it is useful to span a DIV to the edges 
    of your screen.
*/
.screen   {
    position: fixed; 
    width: 100%; 
    top: 0; 
    bottom: 0; 
    right: 0; 
    left: 0;
}

/* Temporary Firefox opacity quickfix (less headache-inducing, unfortunately spikes the RAM usage)  */

@-moz-document url-prefix(){
    #crt    {opacity: 0.1;}
}