header, nav, footer
 {
 display:block;
 }
header
 {
 text-align:center;
 }
h1 {
 color:#32c0cd;
 font-size:160%;
 text-align:center;
 }
h2 {
 color:#32c0cd;
 font-size:150%;
 text-align:center;
 }
h3 {
 color:#32c0cd;
 font-size:150%;
 text-align:center;
 }
#global {
 background:black;
 background-image: url('img/fond_representation_tux01.png');
 background-position:center;
 background-repeat:no-repeat;
 overflow:hidden;
 margin-left:auto;
 margin-right:auto;
 padding:0;
 font-family:Baskerville, Georgia, Garamond, Times, serif;
 }
nav {
 font-size:100%;
 margin-left:380px;
 text-align:center;
 }
a:link {
 color:white;
 }
a:visited {
 color:gray;
 }
a:hover {
 color:green;
 }
footer {
 color:#32c0cd;
 text-align:center;
 }
p {
 text-align:center;
 }
h4 {
 font-size:120%;
 }