Set max width on ccpo admin pages

styles/atat.scss

@@ -47,3 +47,4 @@
 @import "sections/application_edit";
 @import "sections/reports";
 @import "sections/task_order";
+@import "sections/ccpo";

styles/sections/_ccpo.scss

@@ -0,0 +1,3 @@
+.ccpo-panel-container {
+  max-width: $max-panel-width;
+}