ll in 1st column
  +
    30px    : border-right of cell in 1st column
   ======
   130px    : width of 1st column

  So, the width of the cell in first column must be exactly 100px.


  3rd column width calculations
  -----------------------------

    30px    : border-left of cell in 3rd column
  +
    (solve) : width of cell in 3rd column
   =======
   130px    : width of 3rd column

   So, the width of the cell in 3rd column must be exactly 100px.


  Finally, the precise horizontal point where the borde