chrome-extensions-samples/apps/samples/appengine-channelapi/app/index.css

        body {
          font-family: 'Helvetica';
        }

        #board {
          width:152px; 
          height: 152px;
          margin: 20px auto;
        }
        
        #display-area {
          text-align: center;
        }
        
        #this-game {
          font-size: 9pt;
        }
        
        #winner {
        }
        
        table {
          border-collapse: collapse;
        }
        
        td {
          width: 50px;
          height: 50px;
          font-family: "Helvetica";
          font-size: 16pt;
          text-align: center;
          vertical-align: middle;
          margin:0px;
          padding: 0px;
        }
        
        div.cell {
          float: left;
          width: 50px;
          height: 50px;
          border: none;
          margin: 0px;
          padding: 0px;
        }
        
        div.mark {
          position: absolute;
          top: 15px;          
        }
        
        div.l {
          border-right: 1pt solid black;
        }
        
        div.c {
        }
        
        div.r {
          border-left: 1pt solid black;
        }
        
        div.t {
          border-bottom: 1pt solid black;
        }
        
        div.m {
        }
        
        div.b {
          border-top: 1pt solid black;
        }