.button {
  --primary-color: #000;
  --secondary-color: #fff;
  --border-color: #000;
  background-color: var(--primary-color);
  border: 2px solid var(--border-color);
  color: var(--secondary-color);
  padding: 10px 20px;
  font-size: 18px;
  font-weight: bold;
  border-radius: 50px;
  box-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
  position: relative;
  overflow: hidden;
  z-index: 1;
  transition: all 0.3s ease-in-out;
}

.button::before {
  content: "";
  display: block;
  position: absolute;
  top: -100%;
  left: 50%;
  width: 150%;
  height: 150%;
  background-color: var(--secondary-color);
  border-radius: 50%;
  transform: translate(-50%, 0) scale(0);
  z-index: -1;
  transition: all 0.3s ease-in-out;
}

.button:hover {
  background-color: var(--secondary-color);
  color: var(--primary-color);
  transform: translateY(-5px);
  box-shadow: 0 15px 20px rgba(0, 0, 0, 0.2);
}

.button:hover::before {
  transform: translate(-50%, -50%) scale(2);
}

.button:active {
  transform: translateY(0);
  box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);
}