.container{	min-height: 680px;}#book{	width: 420px;	height: 420px;	font-size: 14px;	font-weight: bold;	background-image: url(../images/book.png);	background-repeat: no-repeat;	position: relative;   top: 100px;   left: 30%;}#intro_vision{text-align: center;}#book_txt1{	text-align: right;	position: relative;   top: 110px;   left: -280px;	height: 100px;	width: 300px;   opacity: 0;   transition:  opacity 0.7s linear;}#book_txt2{	font-size: 1.2em;	font-weight: normal;	text-align: center;	position: relative;   top: -190px;   left: -40px;	height: 100px;	width: 400px;}#book_txt3{	text-align: left;	position: relative;   top: -90px;   left: 330px;	height: 100px;	width: 300px;   opacity: 0;   transition:  opacity 0.7s linear;}