@keyframes loadbtn {
  from {
    /*color: #333;*/
    background-position: 100% 0%;
  }
  to {
    background-position: 0% 0%;
  }
}

html, body, .page-container {
  height: 100%;
}

.page-container {
  display: flex;
  align-items: center;
  justify-content: center;
}