#div_facebook {
     /* width:45px; */
    left: 0px;
    bottom: 50px;
   /*  height:250px; */
    position:fixed; 
   /* margin:5px; */
    margin-top: 704px;
    z-index:2;
}
#div_facebook .seg {
    visibility: hidden;
    opacity: 0;
    position:absolute;
    top:0;
    left:0;
}
#div_facebook:hover .seg {
    visibility: visible;
    opacity: 1;
	cursor: pointer;
	
}
#close {
    float:right;
    display:inline-block;
    padding:2px 5px;
    background:#ccc;
}