Image de body background full responsive :

@charset "utf-8";

html {
	overflow: scroll;
}
html, body {
	height: 100 %;
}
img.backgroundfront {
    position:fixed;
    top:0;
    left:0;
    z-index: 100;
}
body {
	margin: 0 auto;
	width: 100%;
	max-width: 100%;
	/*height: 828px;*/
	height: 100%;
	min-height: 100%;
	background-image: url(/images/fonds/fond-flou-lumineux.jpg);
	background-position: center center;
	background-repeat: no-repeat;
	background-attachment: fixed;
	background-color: #FFF;
	background-size: cover;
	position: relative;
	overflow: scroll;
}
table#table-titre,
table#table-biblio,
table#table-fin {
    width: 100%; 
    margin-left: auto; 
    margin-right: auto;
	border-spacing: 0px;
	display: none;
}

/*
th { 
 border-width:1px;
 border-style:solid; 
 border-color:red;
}
td { 
 border-width:1px;
 border-style:solid; 
 border-color:red;
}
*/

a:link,
a:visited,
a:hover
a:active {
	text-decoration: none;
}
@font-face {
    font-family: 'GeosansLight';
	src: url('GeosansLight.ttf') format('truetype');
}










/*----------Titre de la page----------*/

.titre {
	color: #666;
	letter-spacing: 7px;
	text-shadow: 4px 10px 12px rgba(0,0,0,0.7);
	padding: 50px 0px 50px 0px;
	font-family: 'GeosansLight', Verdana, Geneva, sans-serif;
	font-size:  60px;
	font-weight: lighter;
	line-height: 20px;
	width: 600px;
	text-align: center;
	margin-left: auto;
	margin-right: auto;
}
.titre a:link,
.titre a:visited,
.titre a:active {
	color:  #666;
}
.titre a:hover {
	color: #fff;
	-webkit-transition-duration: 0.4s; /* Safari */
    transition-duration: 0.4s;
}
/*p::first-letter {
	font-size: 1.5em;
	margin-right: -5px;
	margin-left: 10px;
}*/
span {
	display: inline-block;
}
span:first-letter {
	font-size: 1.5em;
	margin-right: 0px;
	margin-left: 0px;
}
.inter-titre-1 {
	height: 10px;
	background-color: rgba(0,0,0,0.4);
}
.inter-titre-2 {
	height: 1px;
	background-color: rgba(0,0,0,0.4);
}
.inter-titre-3 {
	height: 10px;
	background-color: rgba(255,255,255,0.4);
}
.inter-titre-4 {
	height: 3px;
	background-color: rgba(0,0,0,0.4);
}
.sous-titre {
	padding: 10px;
	font-family: 'Dosis', sans-serif;
	font-weight: bold;
	font-size: 26px;
	text-align: center;
	vertical-align: middle;
	background-color: rgba(255,255,255,0.2);
}
.sous-titre a:link,
.sous-titre a:visited,
.sous-titre a:hover {
	color: #000;
	text-decoration: none;
}
.sous-titre a:hover {
	color: #fff;
	text-shadow: 1px 1px 10px rgba(0,0,0,0.5);
	-webkit-transition-duration: 0.4s; /* Safari */
    transition-duration: 0.4s;
}







/*----------Bibliographie----------*/

.vignette-livre {
	background-color: rgba(255,255,255,0.4);
	padding-top: 50px;
	padding-right: 10px;
	padding-bottom: 0px;
	padding-left: 10px;
	vertical-align:top;
}
.vignette-livre a {
	display: inline-block;
	-moz-transition: all 0.2s ease-out;
	-webkit-transition: all 0.2s ease-out;
	transition: all 0.2s ease-out;
}
.vignette-livre a:hover,
.vignette-livre a:focus {
	transform: scale(1.2);
}

.vignette-livre-sans-titre {
	background-color: rgba(255,255,255,0.4);
	padding-top: 20px;
	padding-right: 10px;
	padding-bottom: 0px;
	padding-left: 10px;
	vertical-align:top;
}
.vignette-livre-sans-titre a {
	display: inline-block;
	-moz-transition: all 0.2s ease-out;
	-webkit-transition: all 0.2s ease-out;
	transition: all 0.2s ease-out;
}
.vignette-livre-sans-titre a:hover,
.vignette-livre-sans-titre a:focus {
	transform: scale(1.2);
}

 

.ref {
	background-color: rgba(255,255,255,0.4);
	vertical-align: top;
	padding-top: 30px;
	padding-right: 10px;
	padding-bottom: 0px;
	padding-left: 10px;
	
}

.ref-sans-titre {
	background-color: rgba(255,255,255,0.4);
	vertical-align: top;
	padding-top: 0px;
	padding-right: 10px;
	padding-bottom: 0px;
	padding-left: 10px;
	
}

.titre-livre {
	padding: 10px 0px;
	font-family: 'Dosis', sans-serif;
	font-weight: bold;
	font-size: 24px;
}
.ref-livre {
	/**font-family: Arial, Helvetica, sans-serif;**/
	font-family: 'Dosis', sans-serif;
	font-size: 18px;
}
.cliquez-lien-livre {
	/**font-family: Arial, Helvetica, sans-serif;**/
	font-family: 'Dosis', sans-serif;
	font-size: 18px;	
}
.cliquez-lien-livre:link,
.cliquez-lien-livre:visited,
.cliquez-lien-livre:active {
	color: #06C;
	text-decoration: none;
}
.cliquez-lien-livre:hover {
	color: #0CF;
	text-decoration: none;
	-webkit-transition-duration: 0.4s; /* Safari */
    transition-duration: 0.4s;
}


.inter-livre {
	height: 50px;
	background-color: rgba(255,255,255,0.4);
}
.inter-ref-livre {
	background-color: rgba(255,255,255,0.4);
}




/*----------Bas de page----------*/

.fin {
	height: 60px;
	margin: 0px auto;
	background-color: rgba(255,255,255,0.4);
	color: #666;
	text-align: center;
	letter-spacing: 5px;
	text-shadow: 2px 5px 6px rgba(0,0,0,0.7);
	padding: 0px 0px 30px 0px;
	font-family: 'GeosansLight', Verdana, Geneva, sans-serif;
	font-size:  14px;
	font-weight: lighter;
	vertical-align: bottom;
	line-height: 0px;
}








@media only screen
	and (max-width : 480px)
	and (orientation : portrait) {
	/*Smartphone Galaxy S4 mini (portrait)*/
body {
	height: 828px;
}

table#table-titre,
table#table-biblio,
table#table-fin {
    width: 100%;
}

.titre {
	font-size: 46px;
	letter-spacing: 0px;
}

.titre-livre {
	padding: 10px 0px;
	font-family: 'Dosis', sans-serif;
	font-weight: bold;
	font-size: 20px;
}

.ref-livre {
	/**font-family: Arial, Helvetica, sans-serif;**/
	font-family: 'Dosis', sans-serif;
	font-size: 18px;
	padding-right: 5px;
}

.fin {
	letter-spacing: 0px;
}
}

@media only screen
	and (max-width : 720px)
	and (orientation : landscape) {
	/*Smartphone Galaxy S4 mini (paysage)*/

body {
	/*height: 828px;*/
	height: 360px;
}

table#table-titre,
table#table-biblio,
table#table-fin {
    width: 100%;
}
.titre {
	letter-spacing: 3px;
}
}

@media only screen
	and (min-width : 480px)
	and (max-width : 800px)
	and (orientation : portrait) {
	/*Tablette Surface RT (Portrait)*/

table#table-titre,
table#table-biblio,
table#table-fin {
	width: 100%;
}
.titre {
	letter-spacing: 3px;
}
}

@media only screen
	and (min-width : 800px)
	and (max-width : 1200px) {
	/*Tablette Surface RT (paysage)*/
	/*écrans jusqu'à 1200px de large*/

table#table-titre,
table#table-biblio,
table#table-fin {
	width: 80%;
}
.titre {
	letter-spacing: 5px;
}
}

@media only screen
	and (min-width : 1200px)
	and (max-width : 1600px) {
	/*écrans jusquà 1600 px de large*/

table#table-titre,
table#table-biblio,
table#table-fin {
	width: 80%;
}
.titre {
	letter-spacing: 10px;
}
}

@media only screen
	and (min-width : 1600px) {
	/*écrans d'une largeur supérieure à 1600 px*/

table#table-titre,
table#table-biblio,
table#table-fin {
    width: 70%;
}
.titre {
	letter-spacing: 10px;
}
}


/* Return on top */

#returnOnTop {
    background: url('/images/logos/fleche.png') no-repeat;
    bottom: 2%;
    cursor: pointer;
    display: none;
    filter: alpha(opacity = 50); /* IE < 8 */
    height: 60px;
    opacity: 0.5;
    position: fixed;
    right: 2%;
    width: 80px;
}

#returnOnTop:hover {
    filter: alpha(opacity = 100); /* IE < 8 */
    opacity: 1;
}