diff --git a/_sass/minimal-mistakes/_variables.scss b/_sass/minimal-mistakes/_variables.scss
index 37e6c46..8934db1 100644
--- a/_sass/minimal-mistakes/_variables.scss
+++ b/_sass/minimal-mistakes/_variables.scss
@@ -124,6 +124,10 @@ $masthead-link-color: $primary-color !default;
 $masthead-link-color-hover: mix(#000, $primary-color, 25%) !default;
 $navicon-link-color-hover: mix(#fff, $primary-color, 75%) !default;
 
+/* notices */
+$notice-background-mix: 80% !default;
+$code-notice-background-mix: 90% !default;
+
 /* syntax highlighting (base16) */
 $base00: #263238 !default;
 $base01: #2e3c43 !default;