._kefu {
  position: fixed;
  z-index: 999;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
  padding: 10px;
  right: 20px;
  bottom: 80px;
  width: 120px;
  overflow: hidden;
  text-align: center;
  transition: all .3s;
  background: #ffffff;
}
._kefu:hover {
  transform: scale(1.02);
  opacity: .8;
}
._kefu span {
  display: block;
  color: #16a34a;
  padding: 4px;
  margin-bottom: 10px;
  font-size: 1.2em;
  font-weight: 600;
}
._kefu img {
  max-width: 100%;
  border-radius: 10px;
}
._kefu ._btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  margin-top: 10px;
  background-color: #16a34a;
  box-shadow: 0 0 6px rgba(0, 0, 0, 0.1);
  text-decoration: none;
  border-radius: 10px;
  padding: 6px 4px;
  max-width: 100%;
  color: #ffffff;
}