.centra {
    text-align: center;
}

.logo	{
    margin-top: .5em;
    margin-bottom: .5em;
    display: block;
}

.caja	{
	width: 70%;
	margin-left: auto;
	margin-right: auto;
}

.dcha	{
	text-align: right;
}

.izda	{
	text-align: left;
}

.bot-border	{
    border-bottom: thin solid #ccc;
}

.negreta {
    font-weight: bold;
}