Word Press text and post area background colors

In the WordPress Theme ad a custom_style.css file and do following changes to post background and text colors:

/*******************************************
GENERAL STYLING
*******************************************/
body {
    background: #0d1424 url(images/body-bg.jpg) no-repeat center top;
    font: .81em/150% "Lucida Grande", Arial, "Lucida Sans Unicode", sans-serif;
    word-wrap: break-word;
    color: #666;  /* Text color */
}

.
.
.
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/*******************************************
STRUCTURE
*******************************************/
#pagewrap {
    width: 978px;
    margin: 0 auto;
}

/* content */
#content {
    width: 600px;
    float: left;
    background: #000;  /* Background color */
    padding: 35px;
    margin-bottom: 10px;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,.4);