data/style.qss

QMainWindow{
    background-color: yellow
}

QToolTip{
    border: 1px solid rgb(45, 45, 45);
    background: white;
    color: red;
}



QPushButton#btnID{
    border-radius: 30px;
    background-image: url('./images/left.png');
    }

#btnID:hover{
    border-radius: 30px;
    background-image: url('./images/leftHover.png');
    }

QPushButton#btnID:Pressed{
    border-radius: 30px;
    background-image: url('./images/leftPressed.png');
    }

QPushButton {
    background-color: red
}

QPushButton[name="btnProperty"] {
    background-color: blue
}

QGroupBox {
    background-color: qlineargradient(x1: 0, y1: 0, x2: 0, y2: 1,stop: 0 #E0E0E0, stop: 1 #FFFFFF);
    border: 2px solid gray;
    border-radius: 5px;
    margin-top: 1ex; /* leave space at the top for the title */
}

QGroupBox::title {
    subcontrol-origin: margin;
    subcontrol-position: top center; /* position at the top center */
    padding: 0 3px;
    background-color: qlineargradient(x1: 0, y1: 0, x2: 0, y2: 1,stop: 0 #FF0ECE, stop: 1 #FFFFFF);
}
QGroupBox>QCheckBox{
    background-color: yellow
}
QGroupBox>QPushButton{
    border: 2px solid #8f8f91;
    border-radius: 6px;
    background-color: qlineargradient(x1: 0, y1: 0, x2: 0, y2: 1,
                                      stop: 0 #f6f7fa, stop: 1 #dadbde);
    min-width: 80px;
}

QGroupBox>QPushButton:pressed {
    background-color: qlineargradient(x1: 0, y1: 0, x2: 0, y2: 1,
                                      stop: 0 #dadbde, stop: 1 #f6f7fa);
}

QGroupBox>QPushButton:flat {
    border: none; /* no border for a flat push button */
}

QGroupBox>QPushButton:default {
    border-color: navy; /* make the default button prominent */
}


QComboBox {
    border: 1px solid gray;
    border-radius: 3px;
    padding: 1px 18px 1px 3px;
    min-width: 6em;
}

QComboBox::drop-down {
    subcontrol-origin: padding;
    subcontrol-position: top right;
    width: 25px;
    background: red;
    border-left-width: 1px;
    border-left-color: darkgray;
    border-left-style: solid; /* just a single line */
    border-top-right-radius: 3px; /* same radius as the QComboBox */
    border-bottom-right-radius: 3px;
}

QComboBox::down-arrow {
    image: url(./images/dropdown.png);
}