cap image sizes out at the width of the parent when contained in fluid

i2p2www/static/styles/duck/desktop.css

@@ -272,6 +272,10 @@ div#content .aside:first-child {
  * The .inner class is for the content wrapper on inner pages (as opposed to the home page)
  */
 
+.fluid img {
+    max-width: 100%;
+}
+
 div#content .inner .fluid {
     background-repeat: repeat-y;
     border-left: 1px solid #abcc71;