HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS :indeterminate Label Style</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
    }

    input[type="checkbox"] {
      width: 1.1rem;
      height: 1.1rem;
      margin-right: 0.4rem;
      vertical-align: middle;
    }

    input:indeterminate + label {
      color: #a16207;
      font-weight: 700;
      background: #fef9c3;
      padding: 0.15rem 0.4rem;
      border-radius: 0.3rem;
    }

    input:checked + label {
      color: #15803d;
      font-weight: 600;
    }

    label {
      font-size: 0.9375rem;
      color: #334155;
    }
  </style>
</head>
<body>
  <div style="margin-bottom:0.75rem;">
    <input type="checkbox" id="selectAll">
    <label for="selectAll">Select All (partial selection)</label>
  </div>
  <div>
    <input type="checkbox" id="item1" checked>
    <label for="item1">Item 1</label>
  </div>

  <script>
    document.getElementById('selectAll').indeterminate = true;
  </script>
</body>
</html>

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CSS :indeterminate Selector - Label Highlight