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.centered {
    width: 100px; height: 100px;      /* must be present. No matter what the values are */
    position: absolute;               /* to props top/bottom take effect */
    margin: auto;                     /* here's the magic. */
    bottom: 0px; top: 0px;            /* This is how you center a block verticaly; */
    left: 0px; right: 0px;            /* or both vertically AND horizontally. */
}