Fix travis build 🤞 (#759)

* fix travis build

* fix broken build due to incorrect background picker className

.travis.yml

@@ -1,6 +1,11 @@
 language: node_js
 node_js:
   - 10
+addons:
+  apt:
+    packages:
+      # Ubuntu 16+ does not install this dependency by default, so we need to install it ourselves
+      - libgconf-2-4
 cache:
   yarn: true
   directories:

components/BackgroundSelect.js

@@ -37,7 +37,7 @@ class BackgroundSelect extends React.PureComponent {
           border
           center
           selected={isVisible}
-          className={`bg-select-display ${isVisible ? 'is-visible' : ''}`}
+          className={`bg-color-container bg-select-display ${isVisible ? 'is-visible' : ''}`}
           onClick={toggleVisibility}
           background="white"
           hoverBackground="white"