QSlider increase handle size - c++

Question

I need badly to increase size of handle for my slider, but no css options can do this(styleSheet()).
The default example from Qt docs didn't help me as well.
I have a slider like this:
I wish to increase the height of its handle, as shown on explanation image below, but I can't guess how to do it. Probably the only way is to subclass QAbstractSlider?
Here is the stylesheet from my code:
"QSlider::groove:horizontal {"
"border: 1px solid #999999;"
"height: 32px;" /* the groove expands to the size of the slider by default. by giving it a height, it has a fixed size */
"background: qlineargradient(x1:0, y1:0, x2:0, y2:1, stop:0 #B1B1B1, stop:1 #c4c4c4);"
"margin: 2px 0; }"
"QSlider::handle:horizontal {"
"background: qlineargradient(x1:0, y1:0, x2:1, y2:1, stop:0 #b4b4b4, stop:1 #8f8f8f);"
"border: 1px solid #5c5c5c;"
"width: 40px;"
"margin: -20px 0;" /* handle is placed by default on the contents rect of the groove. Expand outside the groove */
"border-radius: 3px;}"
);

Answer 1

Use this stylesheet:
.QSlider {
min-height: 68px;
max-height: 68px;
background: #5F4141;
}
.QSlider::groove:horizontal {
border: 1px solid #262626;
height: 5px;
background: #393939;
margin: 0 12px;
}
.QSlider::handle:horizontal {
background: #22B14C;
border: 5px solid #B5E61D;
width: 23px;
height: 100px;
margin: -24px -12px;
}
It will produce the following:
Please note the the height of the slider is made constant by setting both min-height and max-height to the same value.

Answer 2

I copied your exact code into a form in Qt Designer. The slider handle looks large enough.
However, when adding a layout, the whole slider's size isn't large enough to show the complete handle. I simply added this:
QSlider {
height: 80px;
}
And get this result: