Blog theme park magic change

Grid background

body {
    font-family: “Courier New”,"Bitstream Vera Sans Mono",MONACO,Consolas,"DejaVu Sans Mono",monospace,Arial,sans-serif;
    margin: 0;
    background-image: url(//www.cnblogs.com/skins/BlueSky/images/bg.gif);
    background-repeat: repeat;
    background-color: #FFFDFA;
}

Nice grid background

body {
    margin: 0;
    background-color: #FFFDFA;
    background-repeat: repeat;
    background-image: linear-gradient(90deg, rgba(50, 0, 0, 0.05) 3%, rgba(0, 0, 0, 0) 3%), linear-gradient(360deg, rgba(50, 0, 0, 0.05) 3%, rgba(0, 0, 0, 0) 3%); 
    background-size: 20px 20px; 
    background-position: center center;
}

postbody page article inside grid background

div.blogpost-body {
    background-color: #FFFFFF;
    background-repeat: repeat;
    background-image: linear-gradient(90deg, rgba(50, 0, 0, 0.05) 3%, rgba(0, 0, 0, 0) 3%), linear-gradient(360deg, rgba(50, 0, 0, 0.05) 3%, rgba(0, 0, 0, 0) 3%); 
    background-size: 20px 20px; 
    background-position: center center;
}