ayon-core/openpype/hosts/fusion/api/menu_style.qss

QWidget {
    background-color: #282828;
    border-radius: 3;
}

QPushButton {
    border: 1px solid #090909;
    background-color: #201f1f;
    color: #ffffff;
    padding: 5;
}

QPushButton:focus {
    background-color: "#171717";
    color: #d0d0d0;
}

QPushButton:hover {
    background-color: "#171717";
    color: #e64b3d;
}

#OpenPypeMenu {
    border: 1px solid #fef9ef;
}

#Spacer {
    background-color: #282828;
}