HowTo draw correct CSS border in header?

Question

On the picture represented dialog window with only one widget class QTableWidget. My problem is that bottom border of the header (red square, QHeaderView class) is overlaps with left/right colored borders! What I want, is to make red squares sections view correctly, as green squares.

Here is CSS code from Qt Designer which I'm using:

QTableView#tableWidget QHeaderView::section:horizontal
{
    height: 24px;

    border-style: none;

    border-left: 1px solid #ecedef;
    border-top: 1px solid #161618;
    border-right: 1px solid #b1b1b5;
    border-bottom: 1px solid #161618;

    background-color: qlineargradient(x1:0, y1:0, x2:0, y2:1, stop:0 #f4f4f6, stop:1 #ceced6);
 }

/*
QTableView#tableWidget QHeaderView::section:horizontal:first,
QTableView#tableWidget QHeaderView::section:horizontal:last
{
    border-left-color: qlineargradient(x1:0, y1:0, x2:0, y2:1, stop:0 #f4f4f6, stop:1 #ceced6);
}
*/

Thanks!

---

Update: Here is zoomed picture, just in case...

Answer 1

I had understand how this stuff works!

Solution:

QTableView#tableWidget QHeaderView
{
    /* draw the hole hor top & bottom line for the header */
    height: 24px;

    border-top: 1px solid #161618;
    border-bottom: 1px solid #161618;
}

QTableView#tableWidget QHeaderView::section:horizontal:first
{
    border-left-color: qlineargradient(x1:0, y1:0, x2:0, y2:1, stop:0 #f4f4f6, stop:1 #ceced6);
}

QTableView#tableWidget QHeaderView::section:horizontal:last
{
    border-right-color: qlineargradient(x1:0, y1:0, x2:0, y2:1, stop:0 #f4f4f6, stop:1 #ceced6);
}

QTableView#tableWidget QHeaderView::section:horizontal
{
    /* for each section draw ONLY left & right lines */
    height: 24px;

    border-style: none;

    border-left: 1px solid #ecedef;
    border-right: 1px solid #b1b1b5;

    background-color: qlineargradient(x1:0, y1:0, x2:0, y2:1, stop:0 #f4f4f6, stop:1 #ceced6);

 }

And for additional the result figure how it looks:

Thanks anyway to all!