pushbutton样式-小圆型

    push->setStyleSheet(
        "QPushButton {background-color:rgba(212, 48, 48, 1);border-radius:7px;}"
        "QPushButton:hover {background-color: rgba(212, 38, 38, 1);}"
        "QPushButton:pressed {background-color: rgba(202, 28, 28, 1);}"
     );
    push->setMinimumSize(QSize(14,14));
    push->setMaximumSize(QSize(14,14));