.p-anima-8 {
  position: relative;
  overflow: hidden;
}
.p-anima-8__musk > div {
  background-color: #fff;
  position: absolute;
  top: 0;
  z-index: 2;
  width: 12.5%;
  height: 100%;
}
.p-anima-8.__anima .p-anima-8__musk > div {
  animation: anima_slide_8 0.5s cubic-bezier(0.46, 0.26, 0.15, 0.89) 1 forwards;
}

.p-anima-8__musk > div:nth-of-type(1) {
  left: 0;
  animation-delay: 0.1s !important;
}
.p-anima-8__musk > div:nth-of-type(2) {
  left: 12.5%;
  animation-delay: 0.2s !important;
}
.p-anima-8__musk > div:nth-of-type(3) {
  left: 25%;
  animation-delay: 0.3s !important;
}
.p-anima-8__musk > div:nth-of-type(4) {
  left: 37.5%;
  animation-delay: 0.4s !important;
}
.p-anima-8__musk > div:nth-of-type(5) {
  left: 50%;
  animation-delay: 0.5s !important;
}
.p-anima-8__musk > div:nth-of-type(6) {
  left: 62.5%;
  animation-delay: 0.6s !important;
}
.p-anima-8__musk > div:nth-of-type(7) {
  left: 75%;
  animation-delay: 0.7s !important;
}
.p-anima-8__musk > div:nth-of-type(8) {
  left: 87.5%;
  animation-delay: 0.8s !important;
}


@keyframes anima_slide_8 {
  0% {
    top: 0;
  }
  100% {
    top: -100%;
  }
}


/* アニメーションとは関係のないスタイル（ボタンの見た目など） */
body {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  height: 100vh;
}
button {
  margin-top: 40px;
}
.p-mv {
  display: flex;
  align-items: center;
  background-image: url("https://picsum.photos/900/600");
  background-repeat: no-repeat;
  background-position: 50% 50%;
  background-size: cover;
  padding: 40px;
  height: 200px;
  position: relative;
}
.p-mv::before {
  content: "";
  display: block;
  background-color: rgba(51, 51, 51, 0.5);
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
}
.p-mv__title {
  color: #fff;
  font-size: 56px;
  font-weight: bold;
  line-height: 1.3;
  position: relative;
  z-index: 1;
}
@media screen and (max-width: 640px) {
  .p-mv__title {
    font-size: 24px;
  }
}

document.querySelector('#js-reload').addEventListener('click', (_ev) => {
  const target = _ev.target.getAttribute('data-reload');
  document.querySelector(`#${target}`).classList.remove('__anima');
  setTimeout(() => {
    document.querySelector(`#${target}`).classList.add('__anima');
  }, 500);
});