Make separators black on sponsor page

frontend/src/routes/sponsor/frontpage/index.tsx

@@ -46,14 +46,14 @@ interface FrontPageProps {
   guests: Guest[]
 }
 
-const StyledTableRow = styled(TableRow)(({ theme }) => ({
+const StyledTableRow = styled(TableRow)({
   borderTop: '0',
   borderLeft: '0',
   borderRight: '0',
   borderBottom: '2px solid',
-  borderColor: theme.palette.primary.main,
+  borderColor: 'black',
   borderRadius: '0',
-}))
+})
 
 const StyledAccordion = styled(Accordion)({
   borderStyle: 'none',
@@ -186,9 +186,9 @@ const GuestTable = ({ guests, emptyText }: GuestTableProps) => {
               ))
             )
           ) : (
-            <TableRow>
+            <StyledTableRow>
               <TableCell> {emptyText}</TableCell>
-            </TableRow>
+            </StyledTableRow>
           )}
         </TableBody>
       </Table>