@charset "utf-8";
/* CSS Document */
html {
  scroll-behavior: smooth;
  container-type: scroll-state;
}
.top_button {
  position: fixed;
  bottom: calc(5dvh + 10px);
  right: calc(5dvw + 10px);
  padding: 15px;
  background-color: rgba(51, 51, 51, 0.75);
  color: #fff;
  border-radius: 50%;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
  display: flex;
  text-align: center;
  align-items: center;
  justify-content: center;
  line-height: 1.5;
  width: 75px;
  height: 75px;
  visibility: hidden;
  &:hover {
    background-color: #000;
  }
  @container scroll-state(scrollable: top) {
    & {
      visibility: visible;
    }
  }
}