QTabWidget not styled correctly when using StyleSheet - python-3.x

Question

I am not able to properly style the QTabWidget using the StyleSheet in Qt Designer.
How can I style the tab buttons, the close buttons on them? There is a weird white bezel at the bottom? How can I remove them?
Here is the style sheet for it:
background-color: rgb(58, 68, 102);
border-radius: 4;
border-style: none;
Here is a minimal reproducible example:
The Python file:
from PyQt5.QtWidgets import QApplication, QMainWindow
from PyQt5 import uic
class MainWindow(QMainWindow):
def __init__(self):
super().__init__()
#Loading teh ui file
uic.loadUi('sir.ui', self)
QApp = QApplication([])
window = MainWindow()
window.show()
QApp.exec()
The ui file:
<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>MainWindow</class>
<widget class="QMainWindow" name="MainWindow">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>805</width>
<height>625</height>
</rect>
</property>
<property name="windowTitle">
<string>MainWindow</string>
</property>
<property name="styleSheet">
<string notr="true">background-color: rgb(38, 43, 68);</string>
</property>
<widget class="QWidget" name="centralwidget">
<widget class="QTabWidget" name="tabWidget">
<property name="geometry">
<rect>
<x>10</x>
<y>0</y>
<width>781</width>
<height>581</height>
</rect>
</property>
<property name="focusPolicy">
<enum>Qt::TabFocus</enum>
</property>
<property name="contextMenuPolicy">
<enum>Qt::DefaultContextMenu</enum>
</property>
<property name="acceptDrops">
<bool>true</bool>
</property>
<property name="styleSheet">
<string notr="true">background-color: rgb(58, 68, 102);
border-radius: 4;
border-style: none;</string>
</property>
<property name="tabPosition">
<enum>QTabWidget::North</enum>
</property>
<property name="currentIndex">
<number>0</number>
</property>
<property name="elideMode">
<enum>Qt::ElideRight</enum>
</property>
<property name="tabsClosable">
<bool>true</bool>
</property>
<property name="movable">
<bool>true</bool>
</property>
<widget class="QWidget" name="tab_2">
<attribute name="title">
<string>Home</string>
</attribute>
</widget>
</widget>
</widget>
<widget class="QMenuBar" name="menubar">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>805</width>
<height>21</height>
</rect>
</property>
</widget>
<widget class="QStatusBar" name="statusbar"/>
</widget>
<resources/>
<connections/>
</ui>
Here is the current state: