CodePen Embed - CSS Inner Box Shadow

<div></div>

div {
    width: 500px;
    border: 1px  #CCC solid;
    height: 200px;

    box-shadow: 
        inset 0px 11px 8px -10px #CCC,
        inset 0px -11px 8px -10px #CCC; 
}

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