.blk {width:50px;height:50px;overflow:hidden;}
.card {margin:5px;padding:5px;width:40px;height:40px;border:solid 1px #999999;font:bold 14pt verdana,arial,sans-serif;}
.back {background:#ccc;font;cursor:hand;}
.cf1  {background:#ff0;color:#00f;}
.cf2  {background:#ffa953;color:#80f;}
.cf3  {background:#0cf;color:#fff;}