Update: Updated gtk theme and added gitignore.

usr/share/themes/gtk-dark-keyitdev/gtk-3.0/assets/scalable/small-checkbox-checked-symbolic.svg

@@ -0,0 +1,3 @@
+<svg width="16" height="16" version="1.1" viewBox="0 0 16 16" xmlns="http://www.w3.org/2000/svg">
+ <path d="m8 0a8 8 0 0 0-8 8 8 8 0 0 0 8 8 8 8 0 0 0 8-8 8 8 0 0 0-8-8zm4.5996 3.5898 1.4102 1.4102-8 8-4-4 1.4102-1.4102 2.5898 2.5898 6.5898-6.5898z"/>
+</svg>