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>Кнопка hover</title>
  <style>
    body {
      margin: 0;
      min-height: 100dvh;
      display: grid;
      place-items: center;
      font-family: system-ui, sans-serif;
      background: #fafafa;
    }
    .btn {
      padding: 0.75rem 1.5rem;
      border: none;
      border-radius: 10px;
      background: #2563eb;
      color: #fff;
      font-size: 1rem;
      font-weight: 600;
      cursor: pointer;
      box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
      transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
    }
    .btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(37, 99, 235, 0.4);
      background: #1d4ed8;
    }
    .btn:focus-visible {
      outline: 3px solid #93c5fd;
      outline-offset: 2px;
    }
    .btn:active {
      transform: translateY(0);
      box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
    }
  </style>
</head>
<body>
  <button type="button" class="btn">Отправить</button>
</body>
</html>
<!DOCTYPE html>
<html lang="ru">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Кнопка hover</title>
  <style>
    body {
      margin: 0;
      min-height: 100dvh;
      display: grid;
      place-items: center;
      font-family: system-ui, sans-serif;
      background: #fafafa;
    }
    .btn {
      padding: 0.75rem 1.5rem;
      border: none;
      border-radius: 10px;
      background: #2563eb;
      color: #fff;
      font-size: 1rem;
      font-weight: 600;
      cursor: pointer;
      box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
      transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
    }
    .btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(37, 99, 235, 0.4);
      background: #1d4ed8;
    }
    .btn:focus-visible {
      outline: 3px solid #93c5fd;
      outline-offset: 2px;
    }
    .btn:active {
      transform: translateY(0);
      box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
    }
  </style>
</head>
<body>
  <button type="button" class="btn">Отправить</button>
</body>
</html>