Change '.search-error' color to -medium (#97)

amundsen_application/static/css/_variables-default.scss

@@ -24,7 +24,7 @@ $brand-color-5: #28409f !default;
 $gray-base:     #000 !default;
 $gray-darker:   lighten($gray-base, 10%) !default; // #1a1a1a
 $gray-dark:     lighten($gray-base, 20%) !default; // #333
-$gray:          lighten($gray-base, 35%) !default; // ##595959
+$gray:          lighten($gray-base, 35%) !default; // #595959
 $gray-light:    lighten($gray-base, 55%) !default; // #8c8c8c
 $gray-lighter:  lighten($gray-base, 75%) !default; // #bfbfbf
 $gray-lightest: lighten($gray-base, 95%) !default; // #f2f2f2

amundsen_application/static/js/components/SearchPage/styles.scss

@@ -45,7 +45,7 @@
   }
 
   .search-error {
-    color: $gray-lighter;
+    color: $text-medium;
     text-align: center;
   }