.principal {  font-family: Arial, Helvetica, sans-serif; font-size: 24px; font-style: italic; line-height: normal; font-weight: bold; font-variant: normal; color: #00FF00; background-color: #FF0000; border: #3300FF; border-top-width: thin; border-right-width: thin; border-bottom-width: thin; border-left-width: thin}
.temas {  font-family: Arial, Helvetica, sans-serif; font-size: 24px; font-style: normal; line-height: normal; font-weight: bold; font-variant: normal; color: #FF0000; background-color: #00FF00}