.scroll-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 45px;
  height: 45px;
  background-color: #F2EFE6; /* цвет фона */
  color: #586F6B; /* цвет стрелки */
  text-align: center;
  line-height: 45px;
  font-size: 24px;
  border-radius: 50%;
  z-index: 9999;
  cursor: pointer;
  text-decoration: none;
  transition: opacity 0.3s ease;
  opacity: 0.7;
}
.scroll-to-top:hover {
  opacity: 1;
}