.site-header {
background: url(http://smog-check.org/wp-content/uploads/hdr.png);
min-height: 105px;
position: fixed;
width: 100%;
z-index: 999;
}


.site-footer{
color: #333;
background: url(http://smog-check.org/wp-content/uploads/bg.png);
}<!-- WP Super Cache is installed but broken. The constant WPCACHEHOME must be set in the file wp-config.php and point at the WP Super Cache plugin directory. -->