diff --git a/inst/lib/bsw5/dist/simplex/_variables.scss b/inst/lib/bsw5/dist/simplex/_variables.scss
index af0e710..1571cd8 100755
--- a/inst/lib/bsw5/dist/simplex/_variables.scss
+++ b/inst/lib/bsw5/dist/simplex/_variables.scss
@@ -43,7 +43,9 @@ $min-contrast-ratio:   2.8 !default;
 
 // Body
 
-$body-bg:                   #fcfcfc !default;
+$body-bg:                   mix($white, $black, 99%) !default;
+
+$enable-shadows: true !default;
 
 // Fonts
 
@@ -59,7 +61,7 @@ $dropdown-link-hover-bg:            $primary !default;
 
 $nav-link-padding-y:                .9rem !default;
 $nav-link-disabled-color:           $gray-400 !default;
-$nav-tabs-border-color:             darken(#fff, 6.5%) !default;
+$nav-tabs-border-color:             mix($white, $black, 93.5%) !default;
 
 // Navbar