.btn {
  position: relative;
  font-size: 17px;
  text-transform: uppercase;
  text-decoration: none;
  padding: 1em 2.5em;
  display: inline-block;
  border-radius: 50px;
  transition: all .3s;
  border: none;
  font-family: Arial, sans-serif;
  font-weight: 600;
  color: white;
  background-color: #3498db;
  cursor: pointer;
}

.btn:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.btn:active {
  transform: scale(0.95);
  box-shadow: none;
}

.btn::after {
  content: "";
  display: inline-block;
  height: 100%;
  width: 100%;
  border-radius: 50px;
  position: absolute;
  top: 0;
  left: 0;
  z-index: -1;
  transition: all .4s;
}

.btn::after {
  background-color: #2980b9;
}

.btn:hover::after {
  transform: scaleX(1.2) scaleY(1.4);
  opacity: 0;
}