#hautpage {        position: fixed;        left: 25px;        display:block;        height:57px;        width:49px;    cursor: pointer;        background-image:url("arrow.png");        background-repeat:no-repeat;        background-color:#F68820; /*couleur de fond du bouton*/        z-index:99999;        -moz-opacity: 0.70;        -khtml-opacity: 0.70;        opacity: 0.70;        -ms-filter:"progid:DXImageTransform.Microsoft.Alpha"(Opacity=70);        filter: progid:DXImageTransform.Microsoft.Alpha(opacity=70);        filter:alpha(opacity=70);                        -webkit-border-radius: 8px 8px 0 0;        border-radius: 8px 8px 0 0;        -webkit-transition: all 0.3s ease;        -moz-transition: all 0.3s ease;        -ms-transition: all 0.3s ease;        -o-transition: all 0.3s ease;        transition: all 0.3s ease;}#hautpage:hover{        bottom:0;        -moz-opacity: 1;        -khtml-opacity: 1;        opacity: 1;        -ms-filter:"progid:DXImageTransform.Microsoft.Alpha"(Opacity=100);        filter: progid:DXImageTransform.Microsoft.Alpha(opacity=100);        filter:alpha(opacity=100);}.hautpage_open{        bottom:-10px;        }.hautpage_close{        bottom:-100px;}