.p-anima-6__item {
  display: inline-block;
  position: relative;
}
.p-anima-6__item::before {
  content: "";
  display: block;
  background-color: #333;
  position: absolute;
  top: 0;
  left: 0;
  right: 100%;
  bottom: 0;
}
.p-anima-6.__anima .p-anima-6__item::before {
  animation: anima_bg_6 0.9s ease-out 1 forwards;
}

.p-anima-6__item:nth-of-type(2)::before {
  animation-delay: 0.3s !important;
}

.p-anima-6__item span {
  position: relative;
  z-index: 1;
  opacity: 0;
}
.p-anima-6.__anima .p-anima-6__item span {
  animation: anima_fadein_6 0.5s ease-out 0.9s 1 forwards;
}

@keyframes anima_fadein_6 {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}
@keyframes anima_bg_6 {
  0% {
    left: 0;
    right: 100%;
  }
  40% {
    left: 0;
    right: 0;
  }
  60% {
    left: 0;
    right: 0;
  }
  100% {
    left: 100%;
    right: 0;
  }
}


/* 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);
});