diff --git a/src/dinglehopper/cli.py b/src/dinglehopper/cli.py
index 82ee3ce..43bfb2e 100644
--- a/src/dinglehopper/cli.py
+++ b/src/dinglehopper/cli.py
@@ -32,16 +32,12 @@ def gen_diff_report(gt_in, ocr_in, css_prefix, joiner, none, differences=False):
 
         # Set Bootstrap tooltip to the segment id
         if id_:
-            html_custom_attrs += 'data-toggle="tooltip" title="{}"'.format(id_)
+            html_custom_attrs += f'data-toggle="tooltip" title="{id_}"'
 
         if css_classes:
-            return '<span class="{css_classes}" {html_custom_attrs}>{html_t}</span>'.format(
-                css_classes=css_classes,
-                html_t=html_t,
-                html_custom_attrs=html_custom_attrs,
-            )
+            return f'<span class="{css_classes}" {html_custom_attrs}>{html_t}</span>'
         else:
-            return "{html_t}".format(html_t=html_t)
+            return f"{html_t}"
 
     if isinstance(gt_in, ExtractedText):
         if not isinstance(ocr_in, ExtractedText):