refactor: add % units to numbers

Author: mrholek

scss/_variables.scss

@@ -1205,7 +1205,7 @@ $form-multi-select-box-shadow:              inset 0 1px 2px rgba($black, .075) !
 $form-multi-select-focus-width:             $input-focus-width !default;
 $form-multi-select-focus-color:             $input-color !default;
 $form-multi-select-focus-bg:                $input-bg !default;
-$form-multi-select-focus-border-color:      shift-color($component-active-bg, -25) !default;
+$form-multi-select-focus-border-color:      shift-color($component-active-bg, -25%) !default;
 $form-multi-select-focus-box-shadow:        0 0 0 $form-multi-select-focus-width $input-btn-focus-color !default;
 
 $form-multi-select-selection-tags-padding-y:  .125rem !default;
@@ -1264,7 +1264,7 @@ $form-multi-select-option-padding-y:        .5rem !default;
 $form-multi-select-option-padding-x:        1.25rem !default;
 $form-multi-select-option-border-radius:    $border-radius !default;
 
-$form-multi-select-option-hover-color:     shift-color($gray-900, 5) !default;
+$form-multi-select-option-hover-color:     shift-color($gray-900, +5%) !default;
 $form-multi-select-option-hover-bg:        rgba($gray-100, .5) !default;
 
 $form-multi-select-option-indicator-width:          1em !default;

scss/themes/dark/_variables.scss

@@ -17,7 +17,7 @@ $high-emphasis-dt:    rgba($white, .87) !default;
 $medium-emphasis-dt:  rgba($white, .6) !default;
 $disabled-dt:         rgba($white, .38) !default;
 
-$primary-dt:    tint-color(desaturate($primary, 30%), 30) !default;
+$primary-dt:    tint-color(desaturate($primary, 30%), 30%) !default;
 $secondary-dt:  desaturate($secondary, 30%) !default;
 $success-dt:    desaturate($success, 30%) !default;
 $info-dt:       desaturate($info, 30%) !default;
@@ -454,8 +454,8 @@ $header-theme-map: (
 
 // Links
 
-$link-color-dt:                    shift-color($primary-dt, -12) !default;
-$link-hover-color-dt:              shift-color($link-color-dt, -20) !default;
+$link-color-dt:                    shift-color($primary-dt, -12%) !default;
+$link-hover-color-dt:              shift-color($link-color-dt, -20%) !default;
 
 $link-theme-map: (
   "link-color":        $link-color-dt,