.btn-gradient {
  background: linear-gradient(90deg, #272D3A, #FFF705, #272D3A);
  background-size: 200% 100%;
  animation: gradientShift 3s ease infinite;
}

@keyframes gradientShift {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}