body {
        background-image: url("http://www.wallpaperscharlie.com/wp-content/uploads/2016/09/Cool-Pictures-Nature.jpg");
        margin: 0;
        padding: 0;
        font-family: "Open Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;
        background-size: 100%;
    }
    
    #navBar {
      width: 100%;
      margin: 0 auto;
        padding: 0px;
        background-color: black;
        border-radius: 0em;
      
    }
    
    ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: #333;
}

li {
    float: left;
}

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

li a:hover {
    background-color: gray;
}