Доделал стилизацию интерфейса

TestServerLMS/Debug64/styleSheetTreeWidget.txt

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+QTreeWidget {
+font-size: 14pt; 
+font-family: TimesNewRoman;
+}
+
+QTreeWidget {
+    alternate-background-color: yellow;
+}
+
+QTreeWidget {
+    show-decoration-selected: 1;
+}
+
+QTreeWidget::item {
+    border: 1px solid #d9d9d9;
+    border-top-color: transparent;
+    border-bottom-color: transparent;
+}
+
+QTreeWidget::item:hover {
+    background: qlineargradient(x1: 0, y1: 0, x2: 0, y2: 1, stop: 0 #e7effd, stop: 1 #cbdaf1);
+    border: 1px solid #bfcde4;
+}
+
+QTreeWidget::item:selected {
+    border: 1px solid #567dbc;
+}
+
+QTreeWidget::item:selected:active{
+    background: qlineargradient(x1: 0, y1: 0, x2: 0, y2: 1, stop: 0 #6ea1f1, stop: 1 #567dbc);
+}
+
+QTreeWidget::item:selected:!active {
+    background: qlineargradient(x1: 0, y1: 0, x2: 0, y2: 1, stop: 0 #6b9be8, stop: 1 #577fbf);
+}