How do I style a Qt Widget not its children with stylesheets?

Question

I have a:

class Box : public QWidget

and it has

this->setLayout(new QGridLayout(this));

I tried doin

Answer 1

You need to identify the object class and instance, like in regular CSS.

QWidget#BoxName
{
    border-radius: 5px;
    border: 1px solid black;
    border: 2px groove gray;
}

This is the same answer as here: Get variable name of Qt Widget (for use in Stylesheet)?

box->setStyleSheet(QString::fromUtf8("QWidget#box\n"
"{\n"
"    border-radius: 5px;\n"
"    border: 1px solid black;\n"
"    border: 2px groove gray;\n"
"}\n"
""));