You can also create a writing space in your browser using a data URL, paste the following into your address bar and boom! instant editor. You can bookmark it and will always be available.
``` data:text/html, <html contenteditable> ```
Plus bonus ephemeral, close the tab and your notes are gone with them. Here's an old post with examples using data URL adding style: https://news.ycombinator.com/item?id=6005295