Fix dark border color on Tombstones

app/soapbox/components/tombstone.tsx

@@ -21,7 +21,7 @@ const Tombstone: React.FC<ITombstone> = ({ id, onMoveUp, onMoveDown }) => {
     <HotKeys handlers={handlers}>
       <div className='h-16'>
         <div
-          className='focusable flex h-[42px] items-center justify-center rounded-lg border-2 border-gray-200 text-center'
+          className='focusable flex h-[42px] items-center justify-center rounded-lg border-2 border-gray-200 text-center dark:border-gray-800'
         >
           <Text theme='muted'>
             <FormattedMessage