.success_msg {
  opacity: 0;
  visibility: hidden;
  margin: 1rem 0rem;
  background-color: #efefefef;
  color: #5e9918;
  padding: 0.8rem;
  border: 2px solid;
  box-shadow: 1rem 1rem 2rem;
  position: absolute;
  transition: visibility 0s, opacity 0.3s, liner;
}

.success_msg.hide {
  opacity: 0;
  visibility: hidden;
}

.success_msg.show {
  opacity: 1;
  visibility: visible;
}