.vtdscroll-top {
  position: fixed;
  right: 100px;
  cursor: pointer;
  z-index: 100000;
  background-color: #2f2f2f;
  background-image: -webkit-radial-gradient(farthest-corner at 50% 50%,#767676 0%,#2f2f2f 75%,#3a3b3c 100%);
  background-image: radial-gradient(farthest-corner at 50% 50%,#767676 0%,#2f2f2f 75%,#3a3b3c 100%);
  box-shadow: 0px 0px 9px 0px rgba(0,0,0,0.83);
}
.vtdscroll-top .fa {
  font-size: 64px;
  line-height: 74px;
  color: #fff;
  letter-spacing: 0px;
  vertical-align: middle;
}
.vtdscroll-top {
  bottom: -60px;
  transition: all 1.5s;
}
.vtdscroll-top.btn-visible {
  bottom: 100px;
  transition: all 1.5s;
}

.vtdscroll-top {
  border-radius: 50%;
  transform: rotate(170deg);
  width: 78px;
  height: 78px;
  padding: 0;
  bottom: 30px;
  right: -30px;
  text-align: center;
  opacity: 0;
  transition: all 0.3s;
}
.vtdscroll-top .fa {
  transform: rotate(-45deg);
}
.vtdscroll-top.btn-visible {
  transform: rotate(45deg);
  bottom: 200px;
  right: 30px;
  opacity: 1;
  transition: all 0.3s;
}


