.MV_slide {
  width: 100%;
  overflow: hidden;
  position: relative;
  pointer-events: none;
}
.MV_slide img.maintitle {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  -webkit-transform: translate(-50%, -50%);
  -ms-transform: translate(-50%, -50%);
  width: 100vw;
}

.MV_slide img {
  width: 100vw;
  object-fit: cover;
}
@keyframes zoomUp {
  0% {
    transform: scale(1);
  }
  100% {
    transform: scale(1.1); /* 拡大率 */
  }
}
.add-animation {
  animation: zoomUp 10s linear 0s normal both;
}