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// add to  Photo Contest => Settings => Custom JS >> Contest Single View page and  Contest Gallery
jQuery(".fv-newsletter-checkbox").attr("required", "required");

/* add to Photo Contest => Settings => Custom CSS (at the bottom of page) */
.fv-newsletter-checkbox {
    display: inline-block;
    position: absolute;
    left: 2px;
    top: 2px;
    width: 5px;
    height: 5px;
}

#modal-widget .frm-field-label {
   position: relative;
}