Moving the “share” button

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Well you can do this with css as well, to add button before add to cart, add the following css code in your theme style file i.e : style.css

.ywsfd-social {
    position: absolute;
    bottom: 12%;
    left: 40px;
    margin: 15px 0px;
}

it will work ok till 1024 screen, you have to add media query to perfectly fit it in smaller screens.