How to center a “position: absolute” element

I’m having a problem centering an element that has the attribute position set to absolute. Does anyone know why the images are not centered?

body {
  text-align: center;
}

#slideshowWrapper {
  margin-top: 50px;
  text-align: center;
}

ul#slideshow {
  list-style: none;
  position: relative;
  margin: auto;
}

ul#slideshow li {
  position: absolute;
}

ul#slideshow li img {
  border: 1px solid #ccc;
  padding: 4px;
  height: 450px;
}
<body>
  <div id="slideshowWrapper">
    <ul id="slideshow">
      <li><img src="https://source.unsplash.com/random/300*300?technology" alt="Dummy 1" /></li>
      <li><img src="https://source.unsplash.com/random/301*301?technology" alt="Dummy 2" /></li>
    </ul>
  </div>
</body>

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