.intro {  padding-top: 5px; padding-right: 5px; padding-bottom: 5px; padding-left: 5px}
.Distribution { padding-top: 5px; padding-right: 5px; padding-bottom: 5px; padding-left: 5px ; border-top-width: 10px; border-right-width: 5px; border-bottom-width: 5px; border-left-width: 5px; background-color: #CCCCCC}
.Ref2layer {  border-style: none; border-top-width: 10px; border-right-width: 10px; border-bottom-width: 10px; border-left-width: 10px}
.subtitle {  font-family: Arial, Helvetica, sans-serif; font-weight: bold}
.joint {  font-family: Arial, Helvetica, sans-serif; font-weight: bold}
.freq {  font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 18px; font-weight: bold; text-align: center}