title: Change size of leftIcon in ListItem (material ui)
body: <p>I am working on a react project and I want to increase the height and width of leftIcon in ListItem of material ui. I am passing an image to leftIcon and I want to set the height of this image equal to the height of listItem. I tried giving className to img tag and then setting the height and width from css, but it didn't work. </p>
  
  <p>here is my ListItem </p>
  
  <pre><code>&lt;MuiThemeProvider&gt;
                      &lt;List style={{margin:0, height:58}}&gt;
                          &lt;ListItem leftIcon={ &lt;img className="mediaThumbnail" src="./dev/js/images/paris.jpg"/&gt;} style={{height:70,backgroundColor:"#FFFFFF"}} secondaryText={value.Episode_Name}&gt;
                          &lt;/ListItem&gt;
                      &lt;/List&gt;
                  &lt;/MuiThemeProvider&gt;)
  </code></pre>