.borde { 
border: 1px solid black;
}
 
.td { 
border: 1px solid black;
}

.centrado { margin-left: auto;
        margin-right: auto;
}
 
 .derecha { margin-left: auto;
}

.negrita{
	font-weight: bold;
}

.tachada{
	text-decoration: line-through;
}

#centrado{
	text-align: center;
}