You can change both the color of the text and the background of the input box.
Amy might have it right, but the css I have for it:
Code:
input, textarea, button {
background: #424242 none repeat scroll 0 0;
border: 1px solid #313131;
color: #C3BFD2;
}
Keep in mind, the
button part changes the button color too.
Change the background, border and color.
The login boxes may have another css select as well.