.carousel_img {
  width: 100%;
  position: relative;
}
.carousel_img > ul {
  width: 100%;
  height: 100%;
  position: relative;
}
.carousel_img > ul li {
  width: 100%;
  height: 100%; 
  position: absolute;
  font-size: 50px;
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 0;
  transition: opacity 0.98s;
}
.carousel_img > ul li img {
  width: 100%;
}
.carousel_img > ul li.fill {
  opacity: 1;
}