Loading spinner using HTML + CSS

spinner-full-screen.html

<div id="spinner" role="progressbar" aria-label="Loading"></div>

<style>
  #spinner {
    position: fixed;
    top: 50%;
    left: 50%;
    width: 100px;
    height: 100px;
    border: 4px solid #ddd;
    border-top: 4px solid #3498db;
    border-radius: 50%;
    animation: spin 1s linear infinite;
  }

  @keyframes spin {
    0% {
      transform: translate(-50%, -50%) rotate(0deg);
    }
    100% {
      transform: translate(-50%, -50%) rotate(360deg);
    }
  }
</style>

spinner.html

<div id="spinner" role="progressbar" aria-label="Loading"></div>

<style>
  #spinner {
    width: 50px;
    height: 50px;
    border: 4px solid #ddd;
    border-top: 4px solid #3498db;
    border-radius: 50%;
    animation: spin 1s linear infinite;
  }

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