davejampole on "[Plugin: Contact Form 7] How to make the form boxes show up"

This sets the border thickness and color of text boxes. It also set the radius of the corners (if you want something other than square) and the background color of the text area. Adjust as needed.

/* sets CF7 textarea border and fill color */
.wpcf7 input[type=text], .wpcf7 textarea {
	border: 1px solid #A0A0A0;
	border-radius:5px;
        background:#CCE5FF;

If you don't know the hex codes for colors, and who does, this is a great tool <http://www.rapidtables.com/web/color/RGB_Color.htm> to keep in your toolkit.