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).
The 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 →)
When forcing overlaid header, you can use this class (choose the one that fits your naming preference) on a block that you wish to hide when header is no longer being overlaid on smaller screens. Probably most useful to apply on a Spacer block in custom created page intro section.
As the theme uses CSS flexbox layout in its horizontal widgetized areas you can control the width of widgets displayed there with these classes. For setting up a widget CSS class we recommend using Widget CSS Classes plugin (the theme integrates the classes to the plugin’s interface automatically for your convenience and ease of use).
Apply on column block to decorate the column with a shaded background and padding.