body {
      background:#ccc; 
 }
 img {
    border-style: none; 
 }
 div#tree {
       font-size:13px; 
 }
 div#channel {
       margin:40px;
       font-size:13px; 
 }
 img.img_chan {
      vertical-align:middle; 
 }
 #connexion {
       height:15px;
       width:100px;
       border:solid 1px #000;
       text-align: center;
       font-size: 14px;
       margin-left:10px;
       margin-bottom:5px;
       background:#fff;
       color:#000;
       cursor:hand;
 }
 #connexion:hover {
       background:#222;
       color:#fff;
       cursor:hand;
 }