diff --git a/web/annotation_layer_builder.css b/web/annotation_layer_builder.css
index 14373e367..2608291ff 100644
--- a/web/annotation_layer_builder.css
+++ b/web/annotation_layer_builder.css
@@ -147,6 +147,16 @@
   padding-right: 0;
 }
 
+.annotationLayer .textWidgetAnnotation input.comb:focus {
+  /*
+   * Letter spacing is placed on the right side of each character. Hence, the
+   * letter spacing of the last character may be placed outside the visible
+   * area, causing horizontal scrolling. We avoid this by extending the width
+   * when the element has focus and revert this when it loses focus.
+   */
+  width: 103%;
+}
+
 .annotationLayer .buttonWidgetAnnotation.checkBox input,
 .annotationLayer .buttonWidgetAnnotation.radioButton input {
   appearance: none;