div border-collapse hack2020. 9. 11.
box-shadow:
<border-width> 0 0 0 <border-color>,
0 <border-width> 0 0 <border-color>,
<border-width> <border-width> 0 0 <border-color>,
<border-width> 0 0 0 <border-color> inset,
0 <border-width> 0 0 <border-color> inset;box-shadow:
<border-width> 0 0 0 <border-color>,
0 <border-width> 0 0 <border-color>,
<border-width> <border-width> 0 0 <border-color>,
<border-width> 0 0 0 <border-color> inset,
0 <border-width> 0 0 <border-color> inset;