body {
      background:#173263; 
      color: white;
      font-family: TrebuchetMS, Arial;
 }
 img {
    border-style: none; 
 }
 div#tree {
       font-size:9px; 
 }
 div#channel {
       margin:40px;
       font-size:13px; 
 }
 img.img_chan {
      vertical-align:middle; 
 }
 #connexion {
       height:15px;
       width:100px;
       border:solid 2px black;
       text-align: center;
       font-size: 12px;
       margin-left:10px;
       margin-bottom:5px;
       background:#f0f0f0;
       color:black;
 }
 #connexion:hover {
       background:#f0f0f0;
       color:#dd6900;
 }