.kv {
  position: relative;
  /* height: 738px; */
}
.kv .slideshow {
  position: relative;
  max-width: 1800px;
  /* height: 738px; */
  margin: 0 auto;
  display: flex;
  align-items: flex-start;
}

.kv .slideshow img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  opacity: 0;
  transition: opacity 2s ease-in-out;
}
.kv .slideshow img.active {
  opacity: 1;
}

.cover {
  position: absolute;
  z-index: 15;
  max-width: 1800px;
  width: 100%;
  left: 50%;
  transform: translateX(-50%); 
  display: block;
}
@media (max-width: 428px)  {
  .kv {
    margin-block-start: 0;
  }
  .kv .slideshow,
  .cover {
    display: none;
  }
  .kv img {
    width: 100%;
  }
}