HTML Code

<!DOCTYPE html>

<html>

<head>

  <title>CSS :out-of-range Focus Example</title>

  <style>

    body {

      font-family: system-ui, sans-serif;

      padding: 1.5rem;

    }



    label {

      display: block;

      font-weight: 600;

      font-size: 0.875rem;

      margin-bottom: 0.35rem;

      color: #334155;

    }



    input {

      width: 100%;

      max-width: 14rem;

      padding: 0.5rem 0.75rem;

      border: 2px solid #cbd5e1;

      border-radius: 0.4rem;

      font-size: 0.875rem;

    }



    input:out-of-range {

      border-color: #dc2626;

      background: #fef2f2;

    }



    input:out-of-range:focus {

      outline: none;

      box-shadow: 0 0 0 4px rgba(220, 38, 38, 0.35);

    }



    input:in-range:focus {

      outline: none;

      box-shadow: 0 0 0 4px rgba(22, 163, 74, 0.25);

    }

  </style>

</head>

<body>

  <label for="qty">Quantity (1–10)</label>

  <input type="number" id="qty" min="1" max="10" value="25">

  <p><small>Click the field to see the stronger red focus ring.</small></p>

</body>

</html>

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CSS :out-of-range Selector - Focus Error Ring