serverside with ejs

app.js

const ejs = require("ejs");

app.set('view engine', 'ejs');
app.set('views', './views');
app.use('/public',express.static(__dirname+'/public'));

router

router.get("/", function(req,res){
    res.render(('index'),{title:"EJS main page"});
    
})

public/main.css

a{
    color:blue;
}

views/index.ejs --> not .html

html5 option +
<link href="/public/main.css" rel="stylesheet">
<a><%= locals.title %></a>

result
EJS main page(color is blue)