Create a Site from "Scratch"

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Hi
I want make a Simple Site for my Domain Only Package who have a view MB Storage space include.
I will use this as my Template:

https://www.w3schools.com/w3css/tryit.asp?filename=tryw3css_sidebar_hide&stacked=v

The Top Bar should be floating like:
https://www.w3schools.com/w3css/tryit.asp?filename=tryw3css_navbar_fixed_top

Is there a good Plugin for Notepad++ who allow me to Edit, Create, Write in the "Preview" Window like Mark a Text and Select a Colour like here?
thanks

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I want use the https://www.w3schools.com/w3css/w3css_sidebar.asp Accordion function insted of the Dropdown in Sidebar.
What do I must add to the previouse to have the Accordion function?
Thanks

[niche]

looks like its now standard equipment

https://www.google.com/search?q=preview+window+notepad+%2B%2B&rlz=1C1CHBF_enUS800US800&oq=preview+window+notepad+%2B%2B&aqs=chrome..69i57.12693j1j7&sourceid=chrome&ie=UTF-8

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Hmm there is nothing as default. It seem I need to install some Plugin.

[niche]

Please excuse me. Obviously, that’s what it says. 

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Its sad that nobody replay here...

Do you have a hint how to make 5x accordion under each other?
https://www.w3schools.com/w3css/tryit.asp?filename=tryw3css_sidebar_accordion

THX!