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div.outer {
    width: 300px; /* some width amount needed */
    margin: 0 auto; 
    overflow: visible;
}
div.inner {
    position:relative;
    float: right; /* this was added and display removed */
    right: 50%;
}
div.inner img {
    position: relative; 
    right:-50%; /* this was changed from "left" in original */
}