CSS Safari 6.0.2 Artifacts

HTML

<div id="test"></div>

CSS

#test{
    
    width: 150px;
    height: 150px;

    border-radius: 50%;
    
    background-color: blue;
    box-shadow: inset 0px 3px 0px yellow,
                inset 0px -3px 0px darkred,
                -3px -4px -0px blue;
}


body{
    margin: 5%;
    background-color: gray;
}