.hachi p {
  font-family: 'Hachi Maru Pop';
}

.product_content p {
  font-family: 'Noto Sans JP';
}

.mark span {
  font-size: 12px;
}

.topic {
  height: 500px;
  margin-top: 50px;
  font-size: 36px;
  margin-top: 30px;
  background-color: linear-gradient(180deg, rgba(198, 235, 255, 1) 50%, rgba(198, 235, 255, 1) 100%);
}

@media only screen and (max-width: 750px) {
  .topic {
    height: 400px;
    margin-top: 50px;
    font-size: 36px;
    margin-top: 30px;
    background-color: linear-gradient(180deg, rgba(198, 235, 255, 1) 50%, rgba(198, 235, 255, 1) 100%);
  }
}

.about {
  margin-top: 30px;
}

.about-text {
  font-size: 36px;
  margin-bottom: 24px;
}

li {
  list-style-type: none;
}

.topic-slider {
  width: 80%;
}

.product_content {
  line-height: 30px;
}

.topic-slider img {
  border: 4px solid #00517c;
}

.border_div {
  margin: 15px;
}

.topic-slider .swiper-wrapper {
  transition-timing-function: linear;
}

hr.style5 {
  background-color: #fff;
  border-top: 2px dashed #8c8b8b;
  width: 100%;
}

.slide {
  position: relative;
  width: 100%;
  height: 600px;
  overflow: hidden;
}

@media only screen and (max-width: 750px) {
  .slide {
    position: relative;
    width: 100%;
    height: 300px;
    overflow: hidden;
  }
}

@keyframes slideshow {
  0% {
    opacity: 0;
  }

  10% {
    opacity: 1;
  }

  28% {
    opacity: 1
  }

  38% {
    opacity: 0;
  }

  100% {
    opacity: 0;
  }
}

.slide img {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 100%;
  height: auto;
  opacity: 0;
  animation: slideshow 20s linear infinite;
}

/* nth-childは最初と最後以外の全部をちゃんとする */
/* 始める秒数をちゃんと指定する、1枚の秒数×枚数を全体に指定する */
/* animation-delayはちゃんとロジックを理解していじろう！ */

.slide img:nth-child(2) {
  animation-delay: 5s;
}

.slide img:nth-child(3) {
  animation-delay: 10s;
}

.slide img:last-child {
  animation-delay: 15s;
}