import sys
from PyQt4 import QtGui

STYLESHEET = """
QWidget {
    background-color: rgb(64, 64, 64);
}

QTabWidget::pane { /* The tab widget frame */
     border-top: 2px solid #C2C7CB;
 }

 QTabWidget::tab-bar {
     left: 5px; /* move to the right by 5px */
 }

 /* Style the tab using the tab sub-control. Note that
     it reads QTabBar _not_ QTabWidget */
 QTabBar::tab {
     background: qlineargradient(x1: 0, y1: 0, x2: 0, y2: 1,
                                 stop: 0 #E1E1E1, stop: 0.4 #DDDDDD,
                                 stop: 0.5 #D8D8D8, stop: 1.0 #D3D3D3);
     border: 2px solid #C4C4C3;
     border-bottom-color: #C2C7CB; /* same as the pane color */
     border-top-left-radius: 4px;
     border-top-right-radius: 4px;
     min-width: 8ex;
     padding: 2px;
 }

 QTabBar::tab:selected, QTabBar::tab:hover {
     background: qlineargradient(x1: 0, y1: 0, x2: 0, y2: 1,
                                 stop: 0 #fafafa, stop: 0.4 #f4f4f4,
                                 stop: 0.5 #e7e7e7, stop: 1.0 #fafafa);
 }

 QTabBar::tab:selected {
     border-color: #9B9B9B;
     border-bottom-color: #C2C7CB; /* same as pane color */
 }

 QTabBar::tab:!selected {
     margin-top: 2px; /* make non-selected tabs look smaller */
 }
"""

class Ui(QtGui.QWidget):

    def __init__(self):
        super(Ui, self).__init__()

        self.setStyleSheet(STYLESHEET)

        tabWidget = QtGui.QTabWidget()
        tabWidget.setMovable(True)
        tabWidget.addTab(QtGui.QWidget(), "First")
        tabWidget.addTab(QtGui.QWidget(), "Second")
        tabWidget.addTab(QtGui.QWidget(), "Third")

        gridLayout = QtGui.QGridLayout()
        gridLayout.addWidget(tabWidget,)

        self.setLayout(gridLayout)

        self.resize(600, 300)

app = QtGui.QApplication(sys.argv)
ui = Ui()
ui.show()
sys.exit(app.exec_())