CODE EXAMPLE FOR HTML

loading page html

<style>
.loader {
  border: 16px solid #f3f3f3;
  border-radius: 50%;
  border-top: 16px solid #3498db;
  width: 120px;
  height: 120px;
  animation: spin 2s linear infinite;
}


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

<div class="loader"></div>