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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Speed Converter Tool</title>
  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/css/bootstrap.min.css">
  <style>
    body {
      background-color: #f0f0f0;
      padding: 20px;
    }

    .converter-container {
      max-width: 500px;
      margin: 0 auto;
      background-color: #fff;
      border-radius: 10px;
      padding: 20px;
    }

    h2 {
      text-align: center;
      margin-bottom: 20px;
      color: #007bff;
    }

    .form-group {
      margin-bottom: 15px;
    }

    .result {
      font-weight: bold;
      text-align: center;
      margin-top: 15px;
    }
  </style>
</head>
<body>
  <div class="container">
    <div class="converter-container">
      <h2>Speed Converter</h2>
      <div class="form-group">
        <label for="speed">Enter Speed:</label>
        <input type="number" id="speed" class="form-control" placeholder="Enter speed...">
      </div>
      <div class="form-group">
        <label for="unit">Select Unit:</label>
        <select id="unit" class="form-control">
          <option value="m/s">m/s</option>
          <option value="km/h">km/h</option>
          <option value="mph">mph</option>
        </select>
      </div>
      <div class="form-group">
        <button class="btn btn-primary btn-block" onclick="convertSpeed()">Convert</button>
      </div>
      <div class="result" id="result"></div>
    </div>
  </div>

  <script>
    function convertSpeed() {
      const speed = parseFloat(document.getElementById('speed').value);
      const unit = document.getElementById('unit').value;
      let result = '';

      if (isNaN(speed)) {
        result = 'Please enter a valid number for speed.';
      } else {
        switch (unit) {
          case 'm/s':
            result = `${speed.toFixed(2)} m/s`;
            break;
          case 'km/h':
            result = `${(speed * 3.6).toFixed(2)} km/h`;
            break;
          case 'mph':
            result = `${(speed * 2.237).toFixed(2)} mph`;
            break;
        }
      }

      document.getElementById('result').textContent = result;
    }
  </script>
</body>
</html>