I put the resources package as it was in the sample project in my project including the pages. I ran the command "sass -w src / main / webapp / resources / --sourcemap = none." I added in maven the dependendica ultima-theme-1.0.7. My web.xml looks like this:
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.1" xmlns="
http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="
http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="
http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd">
<context-param>
<param-name>javax.faces.PROJECT_STAGE</param-name>
<param-value>Development</param-value>
</context-param>
<context-param>
<param-name>primefaces.THEME</param-name>
<param-value>primefaces-ultima-blue</param-value>
</context-param>
<context-param>
<param-name>primefaces.FONT_AWESOME</param-name>
<param-value>ultima</param-value>
</context-param>
<context-param>
<param-name>javax.faces.FACELETS_LIBRARIES</param-name>
<param-value>/WEB-INF/primefaces-ultima.taglib.xml</param-value>
</context-param>
<servlet>
<servlet-name>Faces Servlet</servlet-name>
<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Faces Servlet</servlet-name>
<url-pattern>*.xhtml</url-pattern>
</servlet-mapping>
<session-config>
<session-timeout>
30
</session-timeout>
</session-config>
<welcome-file-list>
<welcome-file>teste.xhtml</welcome-file>
</welcome-file-list>
<mime-mapping>
<extension>ttf</extension>
<mime-type>application/font-sfnt</mime-type>
</mime-mapping>
<mime-mapping>
<extension>woff</extension>
<mime-type>application/font-woff</mime-type>
</mime-mapping>
<mime-mapping>
<extension>woff2</extension>
<mime-type>application/font-woff2</mime-type>
</mime-mapping>
<mime-mapping>
<extension>eot</extension>
<mime-type>application/vnd.ms-fontobject</mime-type>
</mime-mapping>
<mime-mapping>
<extension>eot?#iefix</extension>
<mime-type>application/vnd.ms-fontobject</mime-type>
</mime-mapping>
<mime-mapping>
<extension>svg</extension>
<mime-type>image/svg+xml</mime-type>
</mime-mapping>
<mime-mapping>
<extension>svg#exosemibold</extension>
<mime-type>image/svg+xml</mime-type>
</mime-mapping>
<mime-mapping>
<extension>svg#exobolditalic</extension>
<mime-type>image/svg+xml</mime-type>
</mime-mapping>
<mime-mapping>
<extension>svg#exomedium</extension>
<mime-type>image/svg+xml</mime-type>
</mime-mapping>
<mime-mapping>
<extension>svg#exoregular</extension>
<mime-type>image/svg+xml</mime-type>
</mime-mapping>
<mime-mapping>
<extension>svg#fontawesomeregular</extension>
<mime-type>image/svg+xml</mime-type>
</mime-mapping>
</web-app>