Fix color contrast function (#1158)

* fix color contrast function * changelog
elastic · Aug 30, 2018 · 0554fcb · 0554fcb
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,6 +1,8 @@
 ## [`master`](https://github.com/elastic/eui/tree/master)
 
-No public interface changes since `3.8.0`.
+**Bug fixes**
+
+- Fixed `makeHighContrastColor` sass mixin to properly output an accessible color contrast. ([#1158](https://github.com/elastic/eui/pull/1158))
 
 ## [`3.8.0`](https://github.com/elastic/eui/tree/v3.8.0)
 

diff --git a/src/global_styling/functions/_colors.scss b/src/global_styling/functions/_colors.scss
@@ -91,7 +91,7 @@
 
   @while ($contrast < 4.5) {
     $highContrastTextColor: shadeOrTint($highContrastTextColor, 5%, 5%);
-    $contrast: contrastRatio($highContrastTextColor, $euiColorEmptyShade);
+    $contrast: contrastRatio($highContrastTextColor, $background);
   }
 
   @return $highContrastTextColor;