diff --git a/inst/lib/bsw4/dist/darkly/_variables.scss b/inst/lib/bsw4/dist/darkly/_variables.scss
index 375352f..8e3f27f 100755
--- a/inst/lib/bsw4/dist/darkly/_variables.scss
+++ b/inst/lib/bsw4/dist/darkly/_variables.scss
@@ -48,7 +48,6 @@ $danger:        $red !default;
 $light:         body-mix(65%) !default;
 $dark:          body-mix(95%) !default;
 
-$yiq-contrasted-threshold:  175 !default;
 
 $component-active-color: $body-color !default;
 
diff --git a/inst/lib/bsw4/dist/flatly/_variables.scss b/inst/lib/bsw4/dist/flatly/_variables.scss
index f785790..a1e2803 100755
--- a/inst/lib/bsw4/dist/flatly/_variables.scss
+++ b/inst/lib/bsw4/dist/flatly/_variables.scss
@@ -37,7 +37,6 @@ $danger:        $red !default;
 $light:         $gray-200 !default;
 $dark:          $gray-700 !default;
 
-$yiq-contrasted-threshold:  175 !default;
 
 // Links
 
diff --git a/inst/lib/bsw4/dist/litera/_variables.scss b/inst/lib/bsw4/dist/litera/_variables.scss
index d6c0b7c..12d7458 100755
--- a/inst/lib/bsw4/dist/litera/_variables.scss
+++ b/inst/lib/bsw4/dist/litera/_variables.scss
@@ -37,7 +37,6 @@ $danger:        $red !default;
 $light:         $gray-100 !default;
 $dark:          $gray-800 !default;
 
-$yiq-contrasted-threshold:  190 !default;
 
 // Body
 
diff --git a/inst/lib/bsw4/dist/lumen/_variables.scss b/inst/lib/bsw4/dist/lumen/_variables.scss
index 0856dbb..bc03254 100755
--- a/inst/lib/bsw4/dist/lumen/_variables.scss
+++ b/inst/lib/bsw4/dist/lumen/_variables.scss
@@ -37,7 +37,6 @@ $danger:        $red !default;
 $light:         $gray-100 !default;
 $dark:          $gray-700 !default;
 
-$yiq-contrasted-threshold: 200 !default;
 
 // Fonts
 
diff --git a/inst/lib/bsw4/dist/lux/_variables.scss b/inst/lib/bsw4/dist/lux/_variables.scss
index 81cf2cc..d410140 100755
--- a/inst/lib/bsw4/dist/lux/_variables.scss
+++ b/inst/lib/bsw4/dist/lux/_variables.scss
@@ -37,7 +37,6 @@ $danger:        $red !default;
 $light:         $white !default;
 $dark:          $gray-800 !default;
 
-$yiq-contrasted-threshold:  185 !default;
 
 // Options
 
diff --git a/inst/lib/bsw4/dist/materia/_variables.scss b/inst/lib/bsw4/dist/materia/_variables.scss
index f6fed43..54b8bcc 100755
--- a/inst/lib/bsw4/dist/materia/_variables.scss
+++ b/inst/lib/bsw4/dist/materia/_variables.scss
@@ -37,8 +37,6 @@ $danger:        $red !default;
 $light:         $white !default;
 $dark:          $gray-800 !default;
 
-$yiq-contrasted-threshold:  170 !default;
-
 $enable-gradients: true !default;
 
 // Body
diff --git a/inst/lib/bsw4/dist/minty/_variables.scss b/inst/lib/bsw4/dist/minty/_variables.scss
index d9e92a9..3fbe64e 100755
--- a/inst/lib/bsw4/dist/minty/_variables.scss
+++ b/inst/lib/bsw4/dist/minty/_variables.scss
@@ -37,7 +37,6 @@ $danger:        $red !default;
 $light:         $gray-100 !default;
 $dark:          $gray-800 !default;
 
-$yiq-contrasted-threshold: 250 !default;
 
 // Body
 
diff --git a/inst/lib/bsw4/dist/sandstone/_variables.scss b/inst/lib/bsw4/dist/sandstone/_variables.scss
index f37c7f5..fdc5cfe 100755
--- a/inst/lib/bsw4/dist/sandstone/_variables.scss
+++ b/inst/lib/bsw4/dist/sandstone/_variables.scss
@@ -37,7 +37,6 @@ $danger:        $red !default;
 $light:         $gray-200 !default;
 $dark:          $gray-800 !default;
 
-$yiq-contrasted-threshold:  170 !default;
 
 // Body
 
diff --git a/inst/lib/bsw4/dist/sketchy/_variables.scss b/inst/lib/bsw4/dist/sketchy/_variables.scss
index e159662..ae405f1 100755
--- a/inst/lib/bsw4/dist/sketchy/_variables.scss
+++ b/inst/lib/bsw4/dist/sketchy/_variables.scss
@@ -37,7 +37,6 @@ $danger:        $red !default;
 $light:         $white !default;
 $dark:          $gray-700 !default;
 
-$yiq-contrasted-threshold: 200 !default;
 
 // Links
 
diff --git a/inst/lib/bsw4/dist/slate/_variables.scss b/inst/lib/bsw4/dist/slate/_variables.scss
index 8597e00..04baa5f 100755
--- a/inst/lib/bsw4/dist/slate/_variables.scss
+++ b/inst/lib/bsw4/dist/slate/_variables.scss
@@ -36,7 +36,6 @@ $cyan:    #5bc0de !default;
 $body-bg:                   body-mix(100%) !default;
 $body-color:                body-mix(0%) !default;
 
-$yiq-contrasted-threshold:  170 !default;
 
 $contrast-bg: color-contrast($body-bg) !default;
 $contrast-fg: color-contrast($contrast-bg) !default;
diff --git a/inst/lib/bsw4/dist/spacelab/_variables.scss b/inst/lib/bsw4/dist/spacelab/_variables.scss
index a42f455..f37a7e5 100755
--- a/inst/lib/bsw4/dist/spacelab/_variables.scss
+++ b/inst/lib/bsw4/dist/spacelab/_variables.scss
@@ -37,7 +37,6 @@ $danger:        $red !default;
 $light:         $gray-200 !default;
 $dark:          $gray-800 !default;
 
-$yiq-contrasted-threshold: 200 !default;
 
 // Body
 
diff --git a/inst/lib/bsw4/dist/superhero/_variables.scss b/inst/lib/bsw4/dist/superhero/_variables.scss
index 509e3da..5c666bd 100755
--- a/inst/lib/bsw4/dist/superhero/_variables.scss
+++ b/inst/lib/bsw4/dist/superhero/_variables.scss
@@ -48,7 +48,6 @@ $danger:        $red !default;
 $light:         body-mix(48%) !default;
 $dark:          body-mix(80%) !default;
 
-$yiq-contrasted-threshold:  185 !default;
 
 // Components
 
diff --git a/inst/lib/bsw4/dist/united/_variables.scss b/inst/lib/bsw4/dist/united/_variables.scss
index 9a96e66..c035444 100755
--- a/inst/lib/bsw4/dist/united/_variables.scss
+++ b/inst/lib/bsw4/dist/united/_variables.scss
@@ -37,7 +37,6 @@ $danger:        $red !default;
 $light:         $gray-200 !default;
 $dark:          $purple !default;
 
-$yiq-contrasted-threshold: 200 !default;
 
 // Body
 
diff --git a/inst/lib/bsw4/dist/yeti/_variables.scss b/inst/lib/bsw4/dist/yeti/_variables.scss
index 8eae40d..0c7c5e0 100755
--- a/inst/lib/bsw4/dist/yeti/_variables.scss
+++ b/inst/lib/bsw4/dist/yeti/_variables.scss
@@ -37,7 +37,6 @@ $danger:        $red !default;
 $light:         $gray-200 !default;
 $dark:          $gray-900 !default;
 
-$yiq-contrasted-threshold: 200 !default;
 
 // Components