img#homepage{
margin:40px auto 30px;
display:block;
width:676px;
height:255px;
}
img#btn{
margin:0px auto 30px;
display:block;
width:196px;
height:48px;
}
a#btn_a{
margin:0px auto 30px;
display:block;
width:196px;
height:48px;
}