When using “No intro” page template, the overlaid header set in theme options is not applied. However, you can force the overlaid header even in this case using one of these classes on your HTML BODY element (you can use Custom Body Class plugin for that).
force-overlaid-header class will apply default theme overlaid style. The
force-overlaid-header-light/dark class will apply transparent header with light or dark text color. (See example →)