HTMLify

@import url("https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700;800;900&display=swap");

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Poppins", "Franklin Gothic Medium", "Arial Narrow", Arial, sans-serif;
}
body {
  background-color: #141414;
  color: #fff;
  height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
button {
  cursor: pointer;
  position: relative;
  background-color: #3b48ff;
  padding: 20px 30px;
  border: 0;
  border-radius: 4px;
  color: #fff;
  font-size: 16px;
  font-weight: bold;
  text-transform: uppercase;
  letter-spacing: 1px;
  overflow: hidden;
}
.circle {
  position: absolute;
  background-color: #c4c8ff;
  width: 100px;
  height: 100px;
  border-radius: 100vw;
  transform: translate(-50%, -50%) scale(0);
  animation: scale 0.5s ease-in-out;
}
@keyframes scale {
  to {
    transform: translate(-50%, -50%) scale(3);
    opacity: 0;
  }
}