script.js

let sliderImages = document.querySelectorAll(".slide"),
    arrowLeft = document.querySelector("#arrow-left"),
    arrowRight = document.querySelector("#arrow-right"),
    current = 0;

// Clear all images
function reset() {
    for (let i = 0; i < sliderImages.length; i++) {
        sliderImages[i].style.display = "none";
    }
}

// Init slider
function startSlide() {
    reset();
    sliderImages[0].style.display = "block";
}

// Show prev
function slideLeft() {
    reset();
    sliderImages[current - 1].style.display = "block";
    current--;
}

// Show next
function slideRight() {
    reset();
    sliderImages[current + 1].style.display = "block";
    current++;
}

// Left arrow click
arrowLeft.addEventListener("click", function () {
    if (current === 0) {
        current = sliderImages.length;
    }
    slideLeft();
});


// Right arrow click
arrowRight.addEventListener("click", function () {
    if (current === sliderImages.length - 1) {
        current = -1;
    }
    slideRight();
});



setInterval(function () {
    if (current === sliderImages.length - 1) {
        current = -1;
    }
    slideRight();
}, 4000);


$(window).on('scroll', function () {
    if ($(window).scrollTop()) {
        $('nav').addClass('black');

    } else {
        $('nav').removeClass('black');
    }
})



startSlide();