diff --git a/InstructorsAndTrainees/commonview.cpp b/InstructorsAndTrainees/commonview.cpp
index 89f1347..16486e9 100644
--- a/InstructorsAndTrainees/commonview.cpp
+++ b/InstructorsAndTrainees/commonview.cpp
@@ -54,7 +54,7 @@ void CommonView::setItemColor(QTreeWidgetItem *item, QColor color)
 
 int CommonView::calculateWidth_0Column()
 {
-    int widthHeader = treeWidget->width() - 10;
+    int widthHeader = treeWidget->width() - 20;
     int width0Column = 0;
     int widthSB = 0;
     if(treeWidget->verticalScrollBar()->isVisible())