.t1{
			color: #000; font-family: 'descartesJS_Sansserif', sans-serif; font-size: 30px; font-weight: 700; line-height: 60px; margin: 0 0 0; margin:15px 55px 5px 55px; text-align: left; text-transform: uppercase;
		}
		.t2{
			color: #000; font-family: 'descartesJS_Sansserif', sans-serif; font-size: 32px; font-weight: 700; line-height: 40px; margin: 0 0 0; padding: 20px 30px; text-align: center; text-transform: uppercase;
		}
		.t3{
			font-family: 'descartesJS_Sansserif', sans-serif; font-size: 26px; font-weight: 700; line-height: 30px;
			margin:15px 30px 5px 30px; padding: 20px 30px; text-align: center; 
		}
		.t4{
			color: #121ECA; font-family: 'descartesJS_Sansserif', sans-serif; font-size: 22px; font-weight: 700; margin: 0 0 0; margin:25px 55px 0px 55px; font-weight: 580;
		}
		.t5{
			color: #2D7609; font-family: 'descartesJS_Sansserif', sans-serif; font-size: 23px; font-weight: 700; margin: 0 0 0; padding: 2px 5px; 
		}
		.t6{
			color: #00f; font-family: 'descartesJS_Sansserif', sans-serif; font-size: 30px; font-weight: 500; line-height: 24px; margin: 0 0 0; padding: 15px 20px; text-align: left; 
		}
		.t7{
			color: #000; font-family: 'descartesJS_Sansserif', sans-serif; font-size: 30px; font-weight: 500; line-height: 24px; margin: 0 0 0; padding: 20px 25px; text-align: left; 
		}
		.t8{
			color: #2D7609; font-family: 'descartesJS_Sansserif', sans-serif; font-size: 23px; font-weight: 500; margin: 0 0 0; padding: 15px 65px; 
		}
		
		.t9{
			color: #000; font-family: 'descartesJS_Sansserif', sans-serif; font-size: 23px; font-weight: 500; margin: 0 0 0; padding: 15px 65px; 
		}
		.t10{
			color: #ff0; font-family: 'descartesJS_Sansserif', sans-serif; font-size: 74px; font-weight: 700; line-height: 46px; margin: 0 0 0; margin:15px 55px 45px 55px; text-align: center; text-transform: uppercase;
		}
		.t11{
			color: #ff0; font-family: 'descartesJS_Sansserif', sans-serif; font-size: 50px; font-weight: 700; line-height: 52px; margin: 0 0 0; margin:15px 55px 45px 55px; text-align: left; text-transform: uppercase;
		}

#book .own-size{
	width:850px;
	height:785px;
	background-color:white;
	overflow:hidden;
}

#book .izquierda{
	background:-webkit-gradient(linear, left top, right top, color-stop(0.95, #fff), color-stop(1, #dadada));
	background-image:-webkit-linear-gradient(left, #fff 93%, #dadada 100%);
	background-image:-moz-linear-gradient(left, #fff 93%, #dadada 100%);
	background-image:-ms-linear-gradient(left, #fff 93%, #dadada 100%);
	background-image:-o-linear-gradient(left, #fff 93%, #dadada 100%);
	background-image:linear-gradient(left, #fff 93%, #dadada 100%);
}

#book .derecha{
	background:-webkit-gradient(linear, right top, left top, color-stop(0.95, #fff), color-stop(1, #cacaca));
	background-image:-webkit-linear-gradient(right, #fff 95%, #cacaca 100%);
	background-image:-moz-linear-gradient(right, #fff 95%, #cacaca 100%);
	background-image:-ms-linear-gradient(right, #fff 95%, #cacaca 100%);
	background-image:-o-linear-gradient(right, #fff 95%, #cacaca 100%);
	background-image:linear-gradient(right, #fff 95%, #cacaca 100%);
}


		
p {
    color:#000;	font-size:20px; font-family: 'descartesJS_Sansserif', sans-serif; margin:25px 55px 0px 55px; font-weight: 580;
	}
	
h1
{
	color: #000;
	font-family: 'descartesJS_Sansserif', sans-serif;
	font-size: 30px;
	font-weight: 700;
	line-height: 60px;
	margin: 0 0 0;
	margin:15px 55px 5px 55px;
	text-align: center;
	text-transform: uppercase;
}

h2
{
	color: #000;
	font-family: 'descartesJS_Sansserif', sans-serif;
	font-size: 26px;
	font-weight: 700;
	line-height: 60px;
	margin: 0 0 0;
	margin:15px 55px 5px 55px;
	text-align: left;
	text-transform: uppercase;
}

h3
{
	position:absolute;
	bottom:0;
	left:0;
	right:0;
	color: #000;
	font-family: 'descartesJS_Sansserif', sans-serif;
	font-size: 18px;
	font-weight: 500;
	line-height: 16px;
	text-align: center; 
}
		.creditos{
			color: #000; font-family: 'descartesJS_Sansserif', sans-serif; font-size: 32px; font-weight: 500; line-height: 24px; margin: 0 0 0; padding: 20px 25px; text-align: left; 
		}
		
		
		
		#book{
			width:1700px;
			height: 785px;
			margin:70px 5px 5px 97px;
		}
		#book .turn-page{
			background-color:white;
			
		}
		#book .cover{
		
			}
		
		.cover {
			background-color: #F8ECC2;
			background: url(../images/cover.png) no-repeat 1px 50%;
			
		}
		
		#book .page-wrapper{
		-webkit-perspective:2000px;
		-moz-perspective: 2000px;
		-ms-perspective: 2000px;
		perspective: 2000px;
		}

		

	

	
a{
	color:#000;	font-size:20px; font-family: 'descartesJS_SansSerif', sans-serif; text-decoration: none; margin:15px 0px 5px 0px;
			
	}
		
	
		
li{
	list-style:none;
	line-height:30px;
}

#book .span2{
	float:right;
}

#book .a2{
	float:left;
	width:100%;
	clear:both;
	text-decoration:none;
	color:#333;
	margin:2px 0;
	padding:0 10px;
	
}

#book .a2:hover{
	background:#CAD1EE;
	float:left;
	width:100%;
	clear:both;
	text-decoration:none;
	-webkit-border-radius:10px;
	-moz-border-radius:10px;
	-o-border-radius:10px;
	-ms-border-radius:10px;
	border-radius:10px;
}



span#sub {
    vertical-align: sub;
}

body{
	background:transparent url(../images/bg3.png) no-repeat 10px 33px;
	color:#444;
	font-size:12px;
	color: #000;
	
}

.dropbtn {
    background: url("../images/menu3.png" ) no-repeat left top; text-align:left;
	position: absolute;
    color: white;
    padding: 20px;
	height:20px;
    font-size: 16px;
    border: none;
	cursor: pointer;
	top:-40px;
	right:1710px;
}
.dropdown {
    position: relative;
    top: -850px;
	
}

.dropbtn2 {
    background: url("../images/menu1.png" ) no-repeat left top; text-align:left;
	position: relative;
    color: white;
    padding: 20px;
	height:20px;
    font-size: 16px;
    border: none;
    cursor: pointer;
	
	right:-100px;
	
}

.dropdown2 {
    position: relative;
	top: -850px;
}

.dropbtn3 {
    background: url("../images/menu2.png" ) no-repeat left top; text-align:left;
	position: absolute;
    color: white;
    padding: 20px;
	height:20px;
    font-size: 16px;
    border: none;
    cursor: pointer;
	top:-40px;
	right:1660px;
	
}

.dropdown3 {
    position: relative;
	top: -850px;
}

.dropbtn4 {
    background: url("../images/calculadoraDescartes.png" ) no-repeat left top; text-align:left;
	position: absolute;
    color: white;
    padding: 20px;
	height:20px;
    font-size: 16px;
    border: none;
    cursor: pointer;
	top:-40px;
	right:215px;
	
}

.dropdown4 {
    position: relative;
	top: -850px;
}

.dropbtn5 {
    background: url("../images/printer.png" ) no-repeat left top; text-align:left;
	position: absolute;
    color: white;
    padding: 20px;
	height:20px;
    font-size: 16px;
    border: none;
    cursor: pointer;
	top:-42px;
	right:280px;
	
}

.dropdown5 {
    position: relative;
	top: -850px;
}

.dropbtn6 {
    background: url("../images/help.png" ) no-repeat left top; text-align:left;
	position: absolute;
    color: white;
    padding: 20px;
	height:20px;
    font-size: 16px;
    border: none;
    cursor: pointer;
	top:-40px;
	right:170px;
	
}

.dropdown6 {
    position: relative;
	top: -850px;
}

.show {display:block;}

.nextbtn {
    background: url("../images/next2.png" ) no-repeat left top; text-align:center;
    color: white;
    padding: 24px 35px 60px 20px;
	font-size: 16px;
    border: none;
    cursor: pointer;
	top:0;
	right:10px;
}

.nextdown {
    position: absolute;
    right: 0px;
    top: 44%
}

.show {display:block;}

.prevbtn {
    background: url("../images/prev2.png" ) no-repeat left top; text-align:center;
    color: white;
    padding: 24px 35px 70px 24px;
	height:4px;
	font-size: 16px;
    border: none;
    cursor: pointer;
	top:0;
	right:10px;
	
}

.prevdown {
    position: absolute;
    left: 0px;
    top: 44%;
	
		
}
<style>
.tooltip {
    position: relative;
    display: inline-block;
    border-bottom: 1px dotted black;
}

.tooltip .tooltiptext {
	font-size:20px; 
	font-family: 'descartesJS_Sansserif', sans-serif;
	visibility: hidden;
    width: 450px;
    background-color: black;
    color: #fff;
    text-align: center;
    border-radius: 6px;
    padding: 5px 5px;

    /* Position the tooltip */
    position: absolute;
	left:180px;
	z-index: 1;
}

.tooltip:hover .tooltiptext {
    visibility: visible;
}

.footer {
  font-size:14px; 
  font-family: 'descartesJS_Sansserif', sans-serif;
  position: absolute;
  right: 50px;
  bottom: 4em;
  left: 50px;
  padding: 0;
  
  text-align: left;
}
.footer a {
  font-size:14px; 
  color: blue;
  font-family: 'descartesJS_Sansserif', sans-serif;
  margin-right:2px;
  margin-left:2px;
}


</style>