$(document).ready(
    function() {
        alignContentCenter();
    });

$(window).resize(
    function() {
            alignContentCenter();
    });

    function alignContentCenter() {
        //larghezza 980px e altezza 590px
        if ($(window).height() < 590)
            nheigth = 590
        else
            nheigth = $(window).height()
            
        $('#general').css('height', nheigth + 'px');
    }