Improved color contrast

Author: Serfe-com

app/design/frontend/Magento/blank/Magento_Swatches/web/css/source/_module.less

@@ -34,7 +34,7 @@
 
 //  Size and Manufacturer attributes
 @attr-swatch-option__background: @swatch-option__background;
-@attr-swatch-option__color: #949494;
+@attr-swatch-option__color: #474747;
 
 @attr-swatch-option__selected__background: @color-white;
 @attr-swatch-option__selected__border: @border-width__base solid @color-white;
@@ -47,7 +47,7 @@
 //  Tooltip
 @swatch-option-tooltip__background: @color-white;
 @swatch-option-tooltip__border: @swatch-option__border;
-@swatch-option-tooltip__color: #949494;
+@swatch-option-tooltip__color: #474747;
 
 @swatch-option-tooltip-title__color: #282828;