.about-loader {
  width: 50px;
  height: 50px;
  border: 5px solid #ddd;
  border-top-color: #23b86e;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 80px auto;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}