style.css

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background-color: blueviolet;
  font-family: cursive;
}

.button {
  background-color: pink;
  padding: 25px 40px;
  border-radius: 5px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.4);
  text-decoration: none;
  color: black;
  position: relative;
  overflow: hidden;
}

.button span {
  position: relative;
  z-index: 1;
}

.button::before {
  content: '';
  position: absolute;
  background-color: orangered;
  height: 0px;
  width: 0px;
  left: var(--xPos);
  top: var(--yPos);
  transform: translate(-50%, -50%);
  border-radius: 50%;
  transition: width 0.5s, height 0.5s;
}



.button:hover::before {
  width: 300%;
  height: 300%;
}