Optimize Guide Menu's buttons

src/assets/css/styles.styl

@@ -9,6 +9,7 @@
 @import 'loading-screen.styl';
 @import 'remote-play.styl';
 @import 'web-components.styl';
+@import 'guide-menu.styl';
 
 @import 'stream.styl';
 @import 'number-stepper.styl';