html,body {
    direction: rtl;
}
body {
    background: steelblue;
    background: url(../bg.jpg) 50% 50%;
}
.site-wrapper {
    margin:50px auto;
    width:800px;
    border:solid 10px rgba(0,0,0,0.5);
}
.content-wrapper {
    padding:20px;
    background: url(../content-bg.jpg) 50% 50%;
}
img {
    vertical-align: bottom;
}
.book {
    padding:2px;
    margin:10px;
    background: white;
    display: inline-block;
}
.book:hover {
    background: orange;
    cursor: pointer;
}