.site-back-to-top {
  box-sizing: border-box;
  position: fixed;
  right: 30px;
  bottom: 20px;
  z-index: 999;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 50px;
  border: 0;
  border-radius: 5px;
  background: rgba(56, 56, 56, 1);
  color: #fff;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s linear, visibility 0.3s linear, background-color 0.3s linear;
}

.site-back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
}

.site-back-to-top:hover,
.site-back-to-top:focus-visible {
  background: rgba(126, 124, 124, 1);
}

.site-back-to-top:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.75);
  outline-offset: 3px;
}

.site-back-to-top__icon {
  box-sizing: border-box;
  display: block;
  width: 11px;
  height: 11px;
  margin-top: 5px;
  border-top: 2px solid currentColor;
  border-right: 2px solid currentColor;
  transform: rotate(-45deg);
}

@media (max-width: 480px) {
  .site-back-to-top {
    right: 18px;
    bottom: 18px;
    width: 44px;
    height: 44px;
  }
}