Код IT Загрузка примера кода…

HTML main.html 
<!DOCTYPE html>
<html lang="ru">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Spinner</title>
  <style>
    body {
      margin: 0;
      min-height: 100dvh;
      display: grid;
      place-items: center;
      font-family: system-ui, sans-serif;
    }
    .spinner {
      width: 40px;
      height: 40px;
      border: 4px solid #e2e8f0;
      border-top-color: #3b82f6;
      border-radius: 50%;
      animation: spin 0.8s linear infinite;
    }
    @keyframes spin {
      to { transform: rotate(360deg); }
    }
  </style>
</head>
<body>
  <div class="spinner" role="status" aria-label="Загрузка"></div>
</body>
</html>
<!DOCTYPE html>
<html lang="ru">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Spinner</title>
  <style>
    body {
      margin: 0;
      min-height: 100dvh;
      display: grid;
      place-items: center;
      font-family: system-ui, sans-serif;
    }
    .spinner {
      width: 40px;
      height: 40px;
      border: 4px solid #e2e8f0;
      border-top-color: #3b82f6;
      border-radius: 50%;
      animation: spin 0.8s linear infinite;
    }
    @keyframes spin {
      to { transform: rotate(360deg); }
    }
  </style>
</head>
<body>
  <div class="spinner" role="status" aria-label="Загрузка"></div>
</body>
</html>