Use more specific naming

styles/atat.scss

@@ -42,7 +42,7 @@
 @import 'components/audit_log';
 @import 'components/usa_banner';
 @import 'components/checklist';
-@import 'components/full_page_notice.scss';
+@import 'components/dod_login_notice.scss';
 
 @import 'sections/login';
 @import 'sections/home';

styles/components/_dod_login_notice.scss

@@ -1,4 +1,4 @@
-.full-page-notice {
+.dod-login-notice {
   background: rgba(0,0,0,.5);
   bottom: 0;
   left: 0;