Why are some pop up boxes (or "select" boxes) colored blue but others aren't in Mac OS X? I am fairly new to Mac OS X and I am wondering why some of these pop up boxes have a blue in them, but others do not. For example, on one website it looks like this (look at the little "Select site" box):



But then on another site, it looks like this (the "Show:" box):



Is there a different name for each of these? They both look like basic &lt;select&gt; elements but oddly it is blue on one site and not on others.
The blue style is the default "Aqua" style for drop downs, which is what you'll see in most applications. However, sites can customize the appearance of dropdowns using CSS, in which case browsers like Safari and Chrome switch from the default style to the other one you see.

Here's a little example where you can see the style change when you put your mouse on the dropdown.