Ticket #48396: 48396.diff

src/wp-admin/css/colors/_mixins.scss

@@ -40 +40 @@
         &.button-primary-disabled,
         &.disabled {
                 color: hsl( hue( $button-color ), 10%, 80% ) !important;
-                background: lighten( $button-color, 15% ) !important;
-                border-color: lighten( $button-color, 15% ) !important;
+                background: darken( $button-color, 8% ) !important;
+                border-color: darken( $button-color, 8% ) !important;
                 text-shadow: none !important;
         }
 }