nav {
    width:960px;
    margin: 0 auto;
}

nav:before {
    contet:'';
    display:block;
    height:50px;
    width:100%;
    background:#000;
    position:absolute;
    left:0;
    z-index:-1;

}

 ul {
    margin:0;
    padding:0;
    list-style:none;
    height:50px;
}

ul li {
    float:left;
}

ul li a{
    color:#fff;
    display:block;
    height:50px;
    padding:0 30px;
    text-tranform:uppercase;
    text-decoration:none;
    line-height:50px;
}
ul li a:hovor {
    background:#d34d43;
}