left css

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No, you do not need to delete your pages or start over from scratch. Your actual notes/pages live safely in the WordPress database, while the layout structure you are fighting against belongs to the theme layer. Deleting the pages won’t fix the underlying layout behavior because WordPress requires some theme to be active at all times.
Since you want a completely stripped-down, distraction-free environment that acts like a local text editor or markdown file, here are the best ways to bypass your theme’s stubborn styles.
Option 1: Use the “Bones” or “Blank Canvas” Theme (Easiest)
Instead of fighting a complex default theme, you can switch to a theme explicitly built to be a blank slate.
  1. Go to Appearance > Themes > Add New Theme.
  2. Search for Blank Canvas (by Automattic) or Bones.
  3. Install and activate it.
    These themes intentionally strip away all default margins, headers, footers, and complex CSS styling, giving you a literal raw HTML white page where your content naturally starts on the absolute left edge. Your existing pages will seamlessly transfer over to this new layout without losing text.

Option 2: Force the “Blank” Page Template Globally
If you want to keep your current theme but stop it from injecting headers, footers, or margins into your notes:
  1. Open the specific page you want to write on (e.g., your “Scratchpad” page).
  2. Look at the settings sidebar on the right side of the screen.
  3. Under the Page tab, locate the Template option.
  4. Click on whatever template is currently selected (like “Default Template” or “Page”) and change it to Blank.

If “Blank” isn’t an option in your dropdown:
  1. Click New Template (the small icon next to the template name) and name it Scratchpad Layout.
  2. This opens a truly empty template editor screen. Click the + icon, add a single Post Content block, and hit Save.

Option 3: Force Left-Alignment via the Root CSS
If a residual theme layout constraint is still forcing your page content into a centered column, you can override the theme entirely at the root level.
  1. Navigate to Appearance > Editor.
  2. Click the Styles icon in the top right (the split black/white circle).
  3. Click the three vertical dots at the top of that panel and select Additional CSS.
  4. Paste this heavy-handed layout reset script, which forces every layout container on your site to sit on the absolute left edge:

css
body, .wp-site-blocks, .wp-block-post-content, main, article {
    max-width: 100% !important;
    width: 100% !important;
    margin-left: 0 !important;
    margin-right: auto !important;
    padding-left: 20px !important; /* Tiny padding so text doesn't touch your physical screen edge */
}
Use code with caution.

  1. Click Save.

If you try to switch templates or add the CSS and things still look off, let me know the title of the theme currently shown as active under Appearance > Themes, and we can target its structure directly.