body {background:white; color:#000046; font-size:140%; font-family:Chilanka, Papyrus, Wild Script, Lauren C Brown, Learning Curve, Jenelson, Koala, Complete in Him, Cheryl, Chalkduster, BethHand, Avant que, Ampersand, Angelina;}
h6, h5, h4, h3, h2, h1 {text-align:center;}
.sombra {box-shadow:4px 4px 10px #000046; min-height:100px; margin-left:auto; margin-right:auto;}
.csstab {background:#dfdff0; margin:0px auto; min-height:100px; margin-left:auto; margin-right:auto; box-shadow:4px 4px 10px #000046; padding:10px;}
//table {border-collapse:collapse; width:100%}
th, td {text-align:center; width:20px; height:20px; border:1px solid black; padding:8px}

button {height:40px; color:#000046; font-size:100%; font-family:Chilanka, Papyrus, Wild Script, Lauren C Brown, Learning Curve, Jenelson, Koala, Complete in Him, Cheryl, Chalkduster, BethHand, Avant que, Ampersand, Angelina;}

table {
    border-collapse: collapse;
    margin: 20px auto;
}
td {
    width: 60px;
    height: 60px;
    text-align: center;
    border: 1px solid #333;
    font-size: 18px;
}
/* Líneas más gruesas para dividir 3x3 */
td:nth-child(3), td:nth-child(6) {
    border-right: 2px solid #000;
}
tr:nth-child(3) td, tr:nth-child(6) td {
    border-bottom: 2px solid #000;
}