Merge pull request #366 from dod-ccpo/ui/add-usa-header

Add USA header to base templates

styles/atat.scss

@@ -36,6 +36,7 @@
 @import 'components/selector';
 @import 'components/budget_chart';
 @import 'components/audit_log';
+@import 'components/usa_banner';
 
 @import 'sections/login';
 @import 'sections/home';