Center Follow Button on Top of Feed

Center the “Follow” button over the images in the feed.

JavaScript

$('#sb_instagram #sbi_images').prepend( $('.sbi_follow_btn') );

CSS

#sbi_images {
    position: relative;
}
.sbi_follow_btn {
    position: absolute;
    z-index: 2;
    top:50%;
    right:50%;
    margin-right: -85px;
    margin-top: -20px;
}

May need to adjust these numbers to perfectly center the follow button