Adding to existing carousel

How do I add mor images to existing carousel. This template only has one at the moment. And does it affect my CSS?

<div class="carousel-item">
                      <div class="img-box">
                        <img src="images/slider-img.jpg" alt="">
                      </div>

Please just open 1 thread per topic

Closing this duplicate https://forum.freecodecamp.org/t/adding-more-images-to-html-carousel/694567