How to use a custom theme in Liferay

It is very easy to get the portal site to use its own theme (subject) in Liferay, as follows:

(1) In Dock-bar, select Manage->page Layout->look and Feel

(2) then select "Define a specific look and feel for this page"

(3) then select our custom theme (for example, we developed a theme named Demo-theme and have deployed it to the Liferay server)

(4) Finally save, close the pop-up window, refresh the page can see the theme changes (here because of copyright issues, I have to do the company's own logo removed)