body.custom {
    background: #8db6b6 url('http://www.kaylaksthriftyways.com/wp-content/uploads/2010/02/gingham.jpg') 50% 0 yes-repeat;
}

.custom #container {
    margin-top: 2em;
    margin-bottom: 2em;
}

.custom #page {
    background: #fff;
}