.oben {  border-color: #000000 black black; border-style: solid; border-top-width: 1px; border-right-width: 1px; border-bottom-width: 0px; border-left-width: 1px}
.mitte {  border-color: #000000 black black; border-style: solid; border-top-width: 1px; border-right-width: 0px; border-bottom-width: 1px; border-left-width: 0px}
.ml {  border-color: #000000 black black; border-style: solid; border-top-width: 1px; border-right-width: 0px; border-bottom-width: 1px; border-left-width: 1px}
.mr {  border-color: #000000 black black; border-style: solid; border-top-width: 1px; border-right-width: 1px; border-bottom-width: 1px; border-left-width: 0px}
.unten {  border-color: #000000 black black; border-style: solid; border-top-width: 0px; border-right-width: 1px; border-bottom-width: 1px; border-left-width: 1px}
a:hover {  text-decoration: underline}