How do i change black background on frontpage

How do i change black background on frontpage to white

In layout.css:

body {
margin: 0;
padding: 0;
font-family: "Trebuchet MS", Arial, Helvetica, sans-serif;
font-family: Geneva, Verdana, sans-serif;
background-color: #000;
}

cahnge : background-color: #000;