.body-top .wrap-top-btn.scrolled {
  opacity: 1;
}

.body-top .wrap-top-btn {
  position: fixed;
  right: 50px;
  bottom: 50px;
  z-index: 5;
  opacity: 0;
  -webkit-transition: all 0.5s;
  transition: all 0.5s;
}

@media screen and (max-width: 768px) {
  .body-top .wrap-top-btn {
    right: 20px;
    bottom: 66px;
  }
}

.body-top .wrap-top-btn a {
  position: relative;
  display: block;
  font-size: 0;
  width: 56px;
  height: 56px;
  border-radius: 6px;
  background: #242424;
  text-decoration: none;
  opacity: .8;
  -webkit-transition: opacity 0.2s linear;
  transition: opacity 0.2s linear;
}

.body-top .wrap-top-btn a:after {
  content: "";
  position: absolute;
  top: 55%;
  left: 0;
  right: 0;
  display: inline-block;
  width: 7px;
  height: 7px;
  border-bottom: 1px solid #fff;
  border-right: 1px solid #fff;
  -webkit-transform: translateY(-50%) rotate(-135deg);
          transform: translateY(-50%) rotate(-135deg);
  margin: 0 auto;
}

.body-top .wrap-top-btn a:hover {
  opacity: 1;
}