style.css

/* Quick hack to get rid of margin and padding. Typically this would be done by the reset styling.*/
* {
    margin: 0;
    padding: 0;
}

body {
    background-color: #eee;
}

nav {
    width: 100%;
    height: 100px;
    background-color: #fff;
}

ul {
    margin-left: 60px;
}

ul li {
    list-style: none;
    float: left;
    line-height: 100px;
}

ul li a {
    display: block; /* allows to click above or below the actual text */
    text-decoration: none; /* removes underline on a link -> may want to do ths for all links on a site */
    font-size: 14px;
    font-family: Arial, Helvetica, sans-serif;
    color: #1e1e1e;
    padding: 0 20px; /* adds padding of 20px on left and right. not needed on top and bottom due to display:block setting */ 
}

ul li a:hover {
    color: red;
}