index.qss

QWidget#index1, QWidget#index2, QWidget#index3{
    height: 2000px;
    width: 800px;
    background: #000000;
}

QLabel{
    color: gray;
}

QLabel#tip{
    color: white;
    font-size: 30px;
    font-weight: bold;
}

QLabel#pictures{
    width: 120px;
    height: 120px;
    color: gray;
}
QPushButton{
    text-align: left;
    font: auto;
    color: #D9D9D9;
    width: 100px;
    border: 0px;
    background: #0000000;
}

QPushButton::hover{
    text-align: left;
    font: auto;
    font-weight: bold;
    color: #FFFFFF;
    width: 100px;
    border: 0px;
    background: #0000000;
}

QTabWidget::pane{
    border: none;
}

QTabBar::tab{
    height: 15px;
    width: 50px;
    border: 5px solid;
    padding: 5px;
    border-radius: 15px;
    background: #363636;
    color: gray;
    font-size: 13px;
    font-weight: bold;
}

QTabBar::tab:first{
    margin-left: 275px;
}

QTabBar::tab:hover{
    background: #222222;
}

QTabBar::tab:selected{
    background: #000000;
}

QGroupBox{
    border: 0px;
}