header {
    position:absolute;
    width:100%;
    height:0px;
    top:0;
    left:0;
    background:none;

    z-index:100;
}
.spmenu_btn {
    display:block;
    position:absolute;
    top:45px;
    right:40px;
    width:35px;
    height:22px;
    background:#FFF;
    border-top:10px solid #818183;
    border-bottom:10px solid #818183;
    -moz-box-sizing:border-box;
    -webkit-box-sizing:border-box;
    box-sizing:border-box;
    -moz-transition:all 0.3s;
    -webkit-transition:all 0.3s;
    transition:all 0.3s;
}
.spmenu_btn:before {
    content:'';
    position:absolute;
    width:35px;
    height:2px;
    background:#FFF;
    top:-9px;
    right:0;
    -moz-transition:all 0.3s;
    -webkit-transition:all 0.3s;
    transition:all 0.3s;
}
.spmenu_btn:after {
    content:'';
    position:absolute;
    width:35px;
    height:2px;
    background:#FFF;
    bottom:-9px;
    right:0;
    -moz-transition:all 0.3s;
    -webkit-transition:all 0.3s;
    transition:all 0.3s;
}
.spmenu_btn.active {
    background:none;
}
.spmenu_btn.active:before {
    -moz-transform:rotate(-135deg);
    -webkit-transform:rotate(-135deg);
    transform:rotate(-135deg);
    top:0;
    right:0;
}
.spmenu_btn.active:after {
    -moz-transform:rotate(135deg);
    -webkit-transform:rotate(135deg);
    transform:rotate(135deg);
    bottom:0;
    right:0;
}
 
.spmenu {
    display:none;
    position:absolute;
    top:140px;
    left:0;
    width:100%;
    background:#000;
}
nav {
    display:block;
    width:100%;
    margin:0 auto;
}
nav li a {
    display:block;
    width:100%;
    color:#FFF;
    padding:15px;
    -webkit-box-sizing:border-box;
    box-sizing:border-box;
    position:relative;

}
a:link { text-decoration:none; }