* {
  font-family: "Noto Sans JP", sans-serif;
  margin: 0;
  padding: 0;
  line-height: 1;
}

html {
  scroll-behavior: smooth;
}

.fadeA,
.fadeB {
  transition: all 3s;
  opacity: 0;
}

.fadeB {
  margin-top: -100%;
}

.is-visible {
  opacity: 1;
}