如何将元素的颜色从一种颜色设置为另一种颜色？

Okay, so I'm trying to make my own website, and I need to fade a paragraph in and out via a jQuery animation. For this, I've gotten jQuery UI, and I'm trying to animate a test element's color, but it doesn't seem to work. The div's initial color is a semi-transparent, light-grey color (rgba(191, 191, 191, 0.25) to be specific), and I'm trying to animate it to a fully-opaque black (#000000). I'm almost certain my syntax is correct, but I'm not sure I included everything in the right order in the document's header. Could I get some help here? Here's the code for the included scripts and stylesheets:Okay, so I'm trying to make my own website, and