Reigel's demo page

by pwneth

HTML

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CSS

#tail {
    border: 1000px solid #fff;
    position: absolute;
    float: left;
    height: 100px;
    width: 100px;
    background-color: rgba(0,0,0,.0);
    z-index: 100;
    top: 0px;
    left: 0px;
    pointer-events:none;
    -moz-box-shadow:    inset 0 0 20px #000000;
   -webkit-box-shadow: inset 0 0 20px #000000;
   box-shadow:         inset 0 0 20px #000000;
}

JavaScript

$(document).bind('mousemove', function(e){
            $('#tail').css({
               left:  e.pageX - 1050,
               top:   e.pageY - 1050
            });
        });