.ty-backtop {
  position: fixed;
  right: 40px;
  bottom: 30px;
  background-color: rgba(0, 0, 0, 0.3);
  width: 45px;
  height: 45px;
  border-radius: 50%;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  cursor: pointer;
  -webkit-transition: opacity 200ms linear 0s, visibility;
  transition: opacity 200ms linear 0s, visibility; }