HTML Code

<!DOCTYPE html>

<html>

<head>

  <title>CSS :read-write 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: 16rem;

      padding: 0.5rem 0.75rem;

      border: 2px solid #cbd5e1;

      border-radius: 0.4rem;

      font-size: 0.875rem;

      transition: box-shadow 0.2s ease, border-color 0.2s ease;

    }



    input:read-write:focus {

      outline: none;

      border-color: #3b82f6;

      box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.25);

    }

  </style>

</head>

<body>

  <label for="email">Email address</label>

  <input type="email" id="email" placeholder="you@example.com">

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

</body>

</html>

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CSS :read-write Selector - Focus Ring