body {
    
    background-image: url(../images/background.jpg.htm);
}

<style>
         
    #page-wrap {  
    text-align: center;
    width: 800px;
    margin: 0 auto;
    }
        

   * {
                 background-color: aqua;
            } 
            ul { 
            list-style-type: none;
            margin: 0;   
            padding: 0;
            overflow: hidden;
            background-color:aqua;   
            }

            li { 
            float: left;
            }

            li a{ 
            display: block;
            color:indigo;
            text-align: center;
            padding: 14px 16px;
            text-decoration: none;
            }


            li a:hover {
            background-color:#111;
            }







        </style>