.negrita {font-weight: bold;}
.cursiva {font-style: italic;}
.grande {font-size: 36px;}
.rojo {color: red;}
.izquierda {text-align: left;}
.derecha {text-align: right;}
.centrado {text-align: center;}
.subrayado {text-decoration:underline;}

.tcentrada {margin-left: auto;margin-right: auto;}
.tderecha {margin-left: auto;}
table {border: 5px solid black;}
td {border: 1px solid black;}