[Theme: Brand New Day] Trying to change the post text size and color

Since there are many different text areas in Brand New Day, I can’t really tell you exactly what code to use to do this. Something general like the following may work, but won’t target a specific area (and is likely to be overridden by other classes set later in the stylesheet):

body {
  font-size: 12px;
  color: #000;
}

The best way to figure out something like this is to use an addon like Firebug with Firefox (or many other modern browsers have this capability–Chrome, Safari, etc.) to “Inspect” your website (right-click on the spot you want to change and select Inspect to bring up the source) and find the CSS classes you want to modify.