Fairly nice Qt buttons that can be easily made great with a few tweaks of the hex codes.

button.qss

QPushButton {
    color: white;
    background-color: QLinearGradient(x1: 0, y1: 0,
                                      x2: 0, y2: 0.15,
                                      stop: 0 #31363a,
                                      stop: 0.5 #2a2e32);

    border: 1px solid #2a2e32;
    border-radius: 10px;
}

QPushButton:hover {
    background-color: QLinearGradient(x1: 0, y1: 0,
                                      x2: 0, y2: 0.15,
                                      stop: 0 #31363a,
                                      stop: 0.5 #272b2f);
}

QPushButton:pressed {
    background-color: QLinearGradient(x1: 0, y1: 0,
                                      x2: 0, y2: 0.15,
                                      stop: 0 #1e2124,
                                      stop: 0.5 #272b2f);
}