.center {
    margin: 0;
    position: absolute;
    top: 50%;
    left: 50%;
    margin-right: -50%;
    transform: translate(-50%, -50%)
}

.loader {
  border: 4px solid #ffffff;
  border-top: 4px solid #4D45D8;
  border-top-radius:15px;
  border-radius: 50%;
  margin-left: -15px;
  margin-top: 30px;
  position: absolute;
  top: 70%;
  left: 50%;
  width: 30px;
  height: 30px;
  animation: spin 1.5s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}