.c-loader {
  animation: is-rotating 1s infinite;
  border: 6px solid #e5e5e5;
  border-radius: 50%;
  border-top-color: #28a745;
  height: 50px;
  width: 50px;
  display: none;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 1;
}

@keyframes is-rotating {
  to {
    transform: rotate(1turn);
  }
}