$(function(){
    $('.main_visual').slick({
        dots: true,
        arrows: true,
        autoplay: true,
        speed: 300,
        prevArrow: '<button type="button" data-role="none" class="slick-prev" style="display: inline-block;">Previous</button>',
        nextArrow: '<button type="button" data-role="none" class="slick-next" style="display: inline-block;">Next</button>'
    });
});