HTML Code

<!DOCTYPE html>

<html>

<head>

  <title>CSS :out-of-range Age 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[type="number"] {

      width: 100%;

      max-width: 14rem;

      padding: 0.5rem 0.75rem;

      border: 2px solid #cbd5e1;

      border-radius: 0.4rem;

      font-size: 0.875rem;

    }



    input[type="number"]:out-of-range {

      border-color: #dc2626;

      background: #fef2f2;

      color: #b91c1c;

      box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.2);

    }



    input[type="number"]:in-range {

      border-color: #16a34a;

      background: #f0fdf4;

    }

  </style>

</head>

<body>

  <label for="age">Age (18–60)</label>

  <input type="number" id="age" min="18" max="60" value="12">

  <p><small>Enter 12 or 70 to see the red error glow.</small></p>

</body>

</html>

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CSS :out-of-range Selector - Number Input Error Glow