* {
    margin: 0px;
    padding: 0px;
    text-decoration: none;
}

header {
    width: 100%;
    height: 50px;
    background-color: #222222;
}

nav ul {
    float: right;
    margin-top:20px;
    margin-right: 40px;
}

nav ul li {
    list-style: none;
    float: left;
    margin-right: 20px;
}

nav ul li a {
    color: #fff;
    font-family: Arial;
    font-size: 16px;
}
nav ul li a:hover {

   background-color: #ddd;
   color: black;
}