How to use or solve isotop hidden problem or not showing issue

index.html

/* write isotop jquery script on your .html page and use $(window).load(function () {}); function like below */
<script>
$(window).load(function () {
    // our lasest project
    $('.grid').isotope({
    itemSelector: '.grid-item',
    percentPosition: true,
    masonry: {
    columnWidth: 3,
    gutter: 30
    }
    });

    $('ul.filter li').click(function(){ 

    $("ul.filter li").removeClass("active");
    $(this).addClass("active");        

    var selector = $(this).attr('data-filter'); 
    $(".grid").isotope({ 
    filter: selector, 
    animationOptions: { 
        duration: 750, 
        easing: 'linear', 
        queue: false, 
    } 
    }); 
    return false; 
    }); 

});
</script>