Hover stylesheet. PySide2

[Caeden]

        self.pushButton_30.setStyleSheet(u"""
        
background-color: black;
color: white;
border:  2px solid rgb(166, 166, 166);
border-radius: 4px;


""")

I have my stylesheet, but no matter the way I try and do hover it doesnt work-I've tried everything,

        self.pushButton_30.setStyleSheet(u"""
        
ButtonThirty{
background-color: black;
color: white;
border:  2px solid rgb(166, 166, 166);
border-radius: 4px;
}
ButtonThirty:hover{
color: black;
}
""")

I've tried one colon, two colons, ive tried *:hover, can anyone help? Btw when I do the above it makes the entire button black (meaning it didnt parse it correctly, even when I put the color: white it still doesnt work. Anyone know?
Edit:

self.pushButton_30 = QPushButton(self.widget)
        self.pushButton_30.setObjectName(u"pushButton_30")
        self.pushButton_30.setGeometry(QRect(300, 160, 111, 51))
        self.pushButton_30.setStyleSheet(u"""
        
background-color: black;
color: white;
border:  2px solid rgb(166, 166, 166);
border-radius: 4px;


""")
        self.pushButton_30.setAutoDefault(False)

[eyllanesc]

@Caeden try with: app.setStyle("fusion")

[Caeden]

Okay thanks, I will try it