Center image horizontally within a div

This is probably a stupid question but since the usual ways of center aligning an image are not working I thought I would ask. How can I center align (horizontally) an image inside its container div?

Here's the HTML and CSS. I've also included the CSS for the other elements of the thumbnail. It runs in descending order so the highest element is the container of everything and the lowest is inside everything.

#thumbnailwrapper {
      color: #2A2A2A;
      margin-right: 5px;
      border-radius: 0.2em;
      margin-bottom: 5px;
      background-color: #E9F7FE;
      padding: 5px;
      border: thin solid #DADADA;
      font-size: 15px
}
    
#artiststhumbnail {
      width: 120px;
      height: 108px;
      overflow: hidden;
      border: thin solid #DADADA;
      background-color: white;
}
    
#artiststhumbnail:hover {
      left: 50px
}

<!--link here-->

<a href="NotByDesign">
  <div id="thumbnailwrapper">

    <a href="NotByDesign">

      <!--name here-->
      <b>Not By Design</b>
      <br>

      <div id="artiststhumbnail">

        <a href="NotByDesign">

          <!--image here-->
          <img src="../files/noprofile.jpg" height="100%" alt="Not By Design" border="1" />
        </a>
      </div>

      <div id="genre">Punk</div>

  </div>

Okay, I have added the markup without the PHP in so should be easier to see. Neither solution seems to work in practice. The text at top and bottom cannot be centered and the image should be centered within its container div. The container has overflow hidden so I want to see the center of the image as that's normally where the focus is.

#artiststhumbnail a img {
    display:block;
    margin:auto;
}

Here's my solution in: http://jsfiddle.net/marvo/3k3CC/2/

CSS flexbox can do it with justify-content: center on the image parent element. To preserve the aspect ratio of the image, add align-self: flex-start; to it.

HTML

<div class="image-container">
  <img src="http://placehold.it/100x100" />
</div>

CSS

.image-container {
  display: flex;
  justify-content: center;
}

Output:

body {
  background: lightgray;
}
.image-container {
  width: 200px;
  display: flex;
  justify-content: center;
  margin: 10px;
  padding: 10px;
  /* Material design properties */
  background: #fff;
  box-shadow: 0 2px 2px 0 rgba(0, 0, 0, 0.14), 0 3px 1px -2px rgba(0, 0, 0, 0.2), 0 1px 5px 0 rgba(0, 0, 0, 0.12);
}
.image-2 {
  width: 500px;
  align-self: flex-start;  /* to preserve image aspect ratio */
}
.image-3 {
  width: 300px;
  align-self: flex-start;  /* to preserve image aspect ratio */
}

<div class="image-container">
  <img src="http://placehold.it/100x100" />
</div>

<div class="image-container image-2">
  <img src="http://placehold.it/100x100/333" />
</div>

<div class="image-container image-3">
  <img src="http://placehold.it/100x100/666" />
</div>

I just found this solution below on the W3 CSS page and it answered my problem.

img {
    display: block;
    margin-left: auto;
    margin-right: auto;
}

Source: http://www.w3.org/Style/Examples/007/center.en.html

This also would do it

#imagewrapper {
    text-align:center;
}

#imagewrapper img {
    display:inline-block;
    margin:0 5px;
}

Center image horizontally within a div

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