css for for navigation manu site 3astackoverflow com

1<div class="nav">
2    <div id="nav-wrapper">
3      <ul>
4          <li><a href="about.html">About</a></li>
5          <li><a href="portfolio.html">Portfolio</a></li>
6          <li><a href="service.html">Service</a></li>
7          <li><a href="contact.html">Contact</a></li>
8      </ul>
9      <ul class="social">
10          <li class="facebook"><a href="https://www.facebook.com/jason.murray.3975012"</a>Facebook</li>
11          <li class="twitter"><a href="https://twitter.com/jmurray504"</a>Twitter</li>
12          <li class="linkedin"></li><a href="http://http://www.linkedin.com/pub/jason-murray/42/249/440/"</a>Linkedin</li>
13      </ul>
14    </div>
15</div>   
16
17
18CSS
19
20.social {
21list-style-type: none;
22padding: 0;
23margin: 0;
24}
25
26.facebook li {
27        background: url(Image/facebook.png);
28        height: 20px;
29        width: 18px;
30}
31
32.twitter li {
33        background: url(Image/twitter.png);
34        height: 20px;
35        width: 18px;
36}
37
38.linkedin li {
39        background: url(Image/linkedin.png);
40        height: 20px;
41        width: 18px;
42}
43

1.body-color {
2    background: rgb(27,39,57)
3}
4
5a {
6    text-decoration: none;
7    color: red;
8    padding-right: 20px;
9
10}
11
12li {
13    display: inline-block;
14    padding-right: 30px;
15}   
16
17#menu {
18    text-align: center;
19    background-color: white;
20    padding-bottom: 100px;
21}
22