.blanco, .inactiva {background: #fff; margin: 2px; border: 1px #000 solid; width: 100px; height: 100px; float: left;}
.negro  {background: #000; margin: 2px; border: 1px #000 solid; width: 100px; height: 100px; float: left;}

body {font-size:1em; font-family:Arial,Verdana,Sans-Serif; background: #fff;}
h1 {margin: 5px 0 15px 0; font-size:1.5em; font-weight:bold;}
h2 {margin: 5px 0 15px 0; font-size:1.2em; font-weight:bold;}

#tablero {width: 450px; height: 450px; float: left; margin-right: 20px}
#ranking table th {text-align:left; width: 100px; border-bottom:1px #000 solid }
#ranking table td {padding: 5px 0 5px 0;}
.centrado{text-align:center;}