diff --git a/src/ui/bigtext/bigtext.py b/src/ui/bigtext/bigtext.py
index 345a848..38f5b30 100644
--- a/src/ui/bigtext/bigtext.py
+++ b/src/ui/bigtext/bigtext.py
@@ -504,7 +504,7 @@ class InnerBigText(QWidget):
         y_line_offset = self.char_height
         for line in self.lines:
             text = line.line_prepared_for_display()
-            leftmost_visible_char_index = line.column_to_char(self._left_offset - 1)
+            leftmost_visible_char_index = line.column_to_char(self._left_offset)
             rightmost_visible_char_index = line.column_to_char(self._left_offset + math.ceil(self.columns_shown()))
             text = text[
                    leftmost_visible_char_index:rightmost_visible_char_index]  # reduce string to the visible section before drawing
@@ -532,7 +532,13 @@ class InnerBigText(QWidget):
             y1 = y_line_offset - self.char_height + self.char_height / 7
             height = self.char_height
 
-            rect = QRect(round(x1 - left_offset), round(y1), round(width), round(height))
+            left = round(x1 - left_offset)
+            if x1 + width < left_offset \
+                    or x1 > left_offset + self.width():
+                # too far left or too far right
+                continue
+
+            rect = QRect(left, round(y1), round(width), round(height))
             self.highlight_background(painter, rect, highlight.get_brush())
 
     def highlight_background(self, painter: QPainter, rect: QRect, brush: QBrush):