diff --git a/gitconfig b/gitconfig
index be41f09..f1d92ed 100644
--- a/gitconfig
+++ b/gitconfig
@@ -54,7 +54,9 @@
 	diffFilter = delta --color-only
 [delta]
 	side-by-side = true
-[delta "decorations"]
+	plus-style = 'syntax "#142e20"'
+	zero-style = 'syntax "#1d1f21" dim'
+	minus-style = 'syntax "#36181d"'
 	commit-decoration-style = bold yellow box ul
 	file-style = bold yellow ul
 	file-decoration-style = none
diff --git a/script/validatecommit.rb b/script/validatecommit.rb
new file mode 100644
index 0000000..90f717b
--- /dev/null
+++ b/script/validatecommit.rb
@@ -0,0 +1,9 @@
+#!/usr/bin/env ruby
+#
+# frozen_string_literal: true
+
+msg = File.read(ARGV[0])
+unless /\A[[:upper:]]/.match?(msg)
+  puts 'Commit message does not start with an uppercase character'
+  exit 1
+end