There is no real need to create a war to run it from Tomcat. You can follow these steps
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Create a folder in webapps folder e.g. MyApp
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Put your html and css in that folder and name the html file, which you want to be the starting page for your application, index.html
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Start tomcat and point your browser to url “http://localhost:8080/MyApp”. Your index.html page will pop up in the browser