diff --git a/nvitop/gui/library/messagebox.py b/nvitop/gui/library/messagebox.py
index d2faa8c..a8f61d2 100644
--- a/nvitop/gui/library/messagebox.py
+++ b/nvitop/gui/library/messagebox.py
@@ -247,37 +247,38 @@ def send_signal(signal, panel):
                 'SIGTERM',
                 't',
                 panel.selection.terminate,
-                keys=('T'),
+                keys=('T',),
                 attrs=(
                     dict(y=0, x=0, width=7, fg='red'),
-                    dict(y=0, x=3, width=1, fg='red', attr='underline'),
+                    dict(y=0, x=3, width=1, fg='red', attr='bold | underline'),
                 ),
             ),
             MessageBox.Option(
                 'SIGKILL',
                 'k',
                 panel.selection.kill,
-                keys=('K'),
+                keys=('K',),
                 attrs=(
                     dict(y=0, x=0, width=7, fg='red'),
-                    dict(y=0, x=3, width=1, fg='red', attr='underline'),
+                    dict(y=0, x=3, width=1, fg='red', attr='bold | underline'),
                 ),
             ),
             MessageBox.Option(
                 'SIGINT',
                 'i',
                 panel.selection.interrupt,
-                keys=('I'),
+                keys=('I',),
                 attrs=(
                     dict(y=0, x=0, width=6, fg='red'),
-                    dict(y=0, x=3, width=1, fg='red', attr='underline'),
+                    dict(y=0, x=3, width=1, fg='red', attr='bold | underline'),
                 ),
             ),
             MessageBox.Option(
                 'Cancel',
                 'c',
                 None,
-                attrs=(dict(y=0, x=0, width=1, attr='underline'),),
+                keys=('C',),
+                attrs=(dict(y=0, x=0, width=1, attr='bold | underline'),),
             ),
         ],
         default=default,