.fst-scrolltop-button {
  position: fixed;
  right: 20px;
  bottom: 20px;
  width: 50px;
  height: 50px;
  border: none;
  background: #4d6fff;
  border-radius: 50%;
  transform: translateY(30px);
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s ease-in-out;
  cursor: pointer; }
  .fst-scrolltop-button.active {
    transform: translateY(0);
    visibility: visible;
    opacity: 1; }
  .fst-scrolltop-button span {
    position: absolute;
    background: #fff;
    right: calc(100% + 5px);
    width: 95px;
    font-size: 0.9rem;
    top: 50%;
    transform: translateY(-50%);
    border-radius: 4px;
    display: inline-block;
    line-height: 1.9;
    box-shadow: 0 0 15px 0px rgba(0, 0, 0, 0.1);
    opacity: 0;
    transform: translate(-20px, -50%);
    visibility: hidden;
    transition: all 0.2s ease-in-out; }
  .fst-scrolltop-button:hover span {
    opacity: 1;
    visibility: visible;
    transform: translate(0, -50%); }
  .fst-scrolltop-button svg {
    fill: #fff;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%); }