/* 
    CSS du menu déroulant pour trier les livres
    On positionne (en relatif) le conteneur du menu déroulant 
    pour pouvoir positionner le contenu de la liste juste 
    en dessous du span */
    #menuDeroulant{
        border-radius:8px 8px 8px 8px;
        background-color: white;
        margin-top: 0%;
        margin-bottom: 20px;
        padding: 10px;
    }
    #menu-demo2, #menu-demo2 ul{
        padding:0;
        margin:0px;
        list-style:none;
        text-align:center;
        }
        #menu-demo2 li{
        display:inline-block;
        position:relative;
        border-radius:8px 8px 0 0;
        }
        #menu-demo2 ul li{
        display:inherit;
        border-radius:0;
        }
        #menu-demo2 ul li:hover{
        border-radius:0;
        }
        #menu-demo2 ul li:last-child{
        border-radius:0 0 8px 8px;
        }
        #menu-demo2 ul{
        position:absolute;
        z-index: 1000;
        max-height:0;
        left: 0;
        right: 0;
        overflow:hidden;
        -moz-transition: .8s all .3s;
        -webkit-transition: .8s all .3s;
        transition: .8s all .3s;
        }
        #menu-demo2 li:hover ul{
        max-height:15em;
        }
        /* background des liens menus */
        #menu-demo2 li:first-child{
        background-color: #65537A;
        background-image:-webkit-linear-gradient(top, #65537A 0%, #2A2333 100%);
        background-image:linear-gradient(to bottom, #65537A 0%, #2A2333 100%);
        }
        #menu-demo2 li:nth-child(2){
        background-color: #729EBF;
        background-image: -webkit-linear-gradient(top, #729EBF 0%, #333A40 100%);
        background-image:linear-gradient(to bottom, #729EBF 0%, #333A40 100%);
        }
        #menu-demo2 li:nth-child(3){
        background-color: #F6AD1A;
        background-image:-webkit-linear-gradient(top, #F6AD1A 0%, #9F391A 100%);
        background-image:linear-gradient(to bottom, #F6AD1A 0%, #9F391A 100%);
        }
        #menu-demo2 li:last-child{
        background-color: #7eb149;
        background-image:-webkit-linear-gradient(top, #CFFF6A 0%, #677F35 100%);
        background-image:linear-gradient(to bottom, #CFFF6A 0%, #677F35 100%);
        }
        /* background des liens sous menus */
        #menu-demo2 li:first-child li{
        background:#2A2333;
        }
        #menu-demo2 li:nth-child(2) li{
        background:#333A40;
        }
        #menu-demo2 li:nth-child(3) li{
        background:#9F391A;
        }
        #menu-demo2 li:last-child li{
        background:#63b808;
        }
        /* background des liens menus et sous menus au survol */
        #menu-demo2 li:first-child:hover, #menu-demo2 li:first-child li:hover{
        background:#65537A;
        }
        #menu-demo2 li:nth-child(2):hover, #menu-demo2 li:nth-child(2) li:hover{
        background:#729EBF;
        }
        #menu-demo2 li:nth-child(3):hover, #menu-demo2 li:nth-child(3) li:hover{
        background:#F6AD1A;
        }
        #menu-demo2 li:last-child:hover, #menu-demo2 li:last-child li:hover{
        background:#7eb149;
        }
        /* les a href */
        #menu-demo2 a{
        text-decoration:none;
        display:block;
        padding:8px 32px;
        margin: 10px;
        color:#fff;
        font-family:arial;
        }
        #menu-demo2 ul a{
        padding:0px 20;
        text-align: center;
        }
        #menu-demo2 li:hover li a{
        color:#fff;
        }
        #menu-demo2 li:hover a, #menu-demo2 li li:hover a{
        color:#000;
        }