I was browsing through some old repls that I have and found some interesting templates that you might want to use as a starter.
And yes, you can use them as is.
For Websistes
Node.JS
I found this Node.JS template that I made that you can use to create your website using HTML, CSS, and JS with the added help of server-side Node.JS.
I just some time ago, updated this template a bit to make it mode modern looking as well as condense the css.
Fun Fact: This almost used to be my exact website, but with my content on it.
HTML
I found this HTML template that I made that you can use to create your website using HTML, CSS, and JS.
This template renders the same as the Node.JS template, except for the recent changes.
Fun Fact: This used to be my exact website, but with my content on it.
For CSS Features
Flexbox Template
I found this HTML template that I made that you can use to practice your flexbox skills.
Grid Layout Template
I found this HTML template that I made that you can use to practice your CSS grid skills.
For App Mockups
I found this HTML template that I made that you can use to code app mockups that are displayed inside of a mockup phone.
— Adarsh