body
{   background-color:#000;
    background-image: url(img/bg.jpg);
    
    background-position:center top ;
    background-repeat:no-repeat;
    background-color:#000;
    margin:0px;
}

#book{
    width:950px;
    height:538px;
    margin: 0px auto 0px auto;
    background-image:url(img/book.jpg);
    background-repeat:no-repeat;
    position:relative;
}


.enterButton{
    display:block;
    width:107px;
    height:41px;
    background-image:url(img/enterbutton.jpg);
    background-repeat:no-repeat;
}
.enterButton:hover{
     background-position: -107px 0px;
}