.ac {margin: 0px auto; text-align: center;}
.al {text-align: left;}
.ar {text-align: right;}
.strong {font-weight: bold}
.nb {border: none}
.mar {margin-top: 10px; margin-bottom: 10px}

.par {background-color: #F5F5F5}
.impar {background-color: #E0E3FF}

.mb40 {margin-bottom: 40px;}