HTML Code

<!DOCTYPE html>

<html>

<head>

  <title>CSS :required Select 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;

    }



    select {

      width: 100%;

      max-width: 16rem;

      padding: 0.5rem 0.75rem;

      border-radius: 0.4rem;

      font-size: 0.875rem;

      font-family: inherit;

    }



    select:required {

      border: 2px solid #dc2626;

      background: #fef2f2;

    }



    select:optional {

      border: 2px solid #cbd5e1;

      background: #fff;

    }

  </style>

</head>

<body>

  <label for="country">Country *</label>

  <select id="country" required>

    <option value="">Select country</option>

    <option>United States</option>

    <option>United Kingdom</option>

    <option>India</option>

  </select>

</body>

</html>

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CSS :required Selector - Required Select