body {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.shiny {
  position: relative;
  color: white;
  border: none;
  padding: 10px 15px;
  background: #3984ff;
  border-radius: 10px;
  font-weight: bold;
  cursor: pointer;
  overflow: hidden;
}

.shiny::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 40px;
  height: 40px;
  opacity: 0.6;
  background: radial-gradient(white, #3984ff00 80%);
}