.custom-button {
  position: relative;
  display: inline-block;
  padding: 10px 20px;
  background-color: #4CAF50;
  color: white;
  font-size: 16px;
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition-duration: 0.4s;
  overflow: hidden;
}

.custom-button i {
  position: absolute;
  top: 50%;
  left: -20px;
  transform: translateY(-50%);
}

.custom-button:hover {
  background-color: #45a049;
}

.custom-button:hover i {
  left: 10px;
}