change spacer by qwidget fake spacer

mainwindow.py

@@ -48,6 +48,8 @@ class MainWindow(QMainWindow):
         # Adjust UI
         self.maintitle_label.setFont(QFont(font_family, 38))
         self.subtitle_label.setStyleSheet("color: rgb(163, 177, 198)")
+        self.staff_btn.hide()
+        self.spacer_substitution.hide()
 
         # Find the button by its objectName in Qt Designer
         # Example: objectName = "close_btn"

mainwindow.ui

@@ -136,7 +136,7 @@
          </property>
          <property name="maximumSize">
           <size>
-           <width>42</width>
+           <width>25</width>
            <height>25</height>
           </size>
          </property>
@@ -446,17 +446,14 @@
                 </widget>
                </item>
                <item>
-                <spacer name="horizontalSpacer_5">
-                 <property name="orientation">
-                  <enum>Qt::Orientation::Horizontal</enum>
-                 </property>
-                 <property name="sizeHint" stdset="0">
+                <widget class="QWidget" name="spacer_substitution" native="true">
+                 <property name="minimumSize">
                   <size>
-                   <width>40</width>
-                   <height>20</height>
+                   <width>53</width>
+                   <height>0</height>
                   </size>
                  </property>
-                </spacer>
+                </widget>
                </item>
                <item>
                 <widget class="QPushButton" name="staff_btn">

styles.qss

@@ -26,6 +26,6 @@ QPushButton#minimize_btn {
     border-bottom: 5px solid white;
     color: white;
     font-size: 18px;
-    padding: 10px;
+    padding: 0px;
     padding-top: 0
 }