.top-operation {
  width: 60px;
  height: 60px;
  background: #fff;
  position: fixed;
  z-index: 3;
  right: 45px;
  bottom: 60px;
  cursor: pointer;
  transform: scale(0);
  box-shadow: 0px 1px 4px 0px rgba(0,0,0,0.17);
  border-radius: 3px;
  color: #989898;
  display: flex;
  justify-content: center;
  align-items: center;
}

.top-operation-hover {
  background-image: linear-gradient(#FFDD00, #FFDD00);
  background-position: 0 100%;
  background-repeat: no-repeat;
  background-size: 100% 0;
  transition: background-size .3s;
}

.top-operation-hover:hover {
  color: #FFFFFF;
  background-size: 100% 100%;
}

.top-animate {
  transform: scale(1);
  transition: all 600ms;
}

.top-animate-close {
  transform: scale(0);
  transition: all 600ms;
}