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Theming

BlogMore generates sites with a responsive, light/dark-aware default design. You can customise every aspect of the appearance — from a quick colour tweak to a completely different layout — without touching the BlogMore source code.

Looking for template docs?

Template customisation (overriding HTML templates) is covered in the Templates reference. This guide focuses on colour schemes, typography, and how the two approaches work together.

How the styling works

BlogMore embeds a single stylesheet (static/style.css) in every generated site. The stylesheet is built around CSS custom properties (variables) so that colour schemes can be swapped by changing only those properties. A small JavaScript file (static/theme.js) reads the user's OS preference and any saved cookie preference, then sets data-theme="dark" or data-theme="light" on the <html> element accordingly.

Dark mode colour variables

Dark mode colours are declared once in :root as --dark-* variables. Both the JavaScript-driven [data-theme="dark"] selector and the CSS media query fallback (used when JavaScript is disabled) reference those shared variables via var(). This means you only need to override the --dark-* variables in your custom stylesheet to change dark mode colours across the entire site.

Quick start: change colours with a custom stylesheet

The simplest way to customise a BlogMore site is to add a stylesheet that overrides CSS custom properties. No template changes required.

1. Create your stylesheet

Place a CSS file in your blog's extras/ directory:

my-blog/
├── extras/
│   └── custom.css    ← your theme file
├── posts/
└── blogmore.yaml

2. Register it in your configuration

# blogmore.yaml
extra_stylesheets:
  - /custom.css

Your stylesheet is loaded after the built-in one, so any rules you declare will override the defaults.

3. Override variables

/* custom.css — light mode overrides */
:root {
    --link-color: #c0392b;
    --link-hover-color: #96281b;
    --link-visited-color: #922b21;
}

For dark mode, override the --dark-* palette variables (they are shared by both the media query fallback and the JavaScript toggle):

/* custom.css — dark mode palette */
:root {
    --dark-bg-color: #0d1117;
    --dark-text-color: #c9d1d9;
    --dark-link-color: #58a6ff;
}

Complete CSS variable reference

Light mode active values

These variables are the values actually used in rendered pages. They default to light mode values. In dark mode they are automatically set to the corresponding --dark-* values.

Variable Default Description
--bg-color #fff Page background
--text-color #333 Primary text
--text-secondary #666 Secondary text (dates, metadata)
--border-color #eee Primary borders
--border-color-light #f0f0f0 Subtle borders
--link-color #0066cc Link colour
--link-hover-color #0052a3 Link hover state
--link-visited-color #551a8b Visited link colour
--hover-color #0066cc General hover highlight
--hover-color-dark #0052a3 Darker hover highlight
--code-bg #f5f5f5 Inline and block code background
--tag-bg #f0f0f0 Tag badge background
--tag-hover-bg #e0e0e0 Tag badge hover background
--category-bg #e8f4f8 Category badge background
--category-hover-bg #d0e8f2 Category badge hover background
--category-text #0066cc Category badge text
--blockquote-border #ddd Blockquote left border
--table-border #ddd Table borders
--table-header-bg #f0f0f0 Table header row background
--table-stripe-bg #fafafa Alternating table row background
--admonition-note-title-color #0969da Note admonition title
--admonition-tip-title-color #1a7f37 Tip admonition title
--admonition-important-title-color #8250df Important admonition title
--admonition-warning-title-color #9a6700 Warning admonition title
--admonition-caution-title-color #d1242f Caution admonition title

Dark mode palette variables

These variables hold the colour values used in dark mode. Override them to customise how the site looks when dark mode is active — the change applies automatically to both the JavaScript toggle and the CSS media query fallback.

Variable Default Description
--dark-bg-color #1a1a1a Dark mode page background
--dark-text-color #e0e0e0 Dark mode primary text
--dark-text-secondary #a0a0a0 Dark mode secondary text
--dark-border-color #333 Dark mode primary borders
--dark-border-color-light #2a2a2a Dark mode subtle borders
--dark-link-color #6eb3ff Dark mode link colour
--dark-link-hover-color #8cc5ff Dark mode link hover
--dark-link-visited-color #b399ff Dark mode visited link
--dark-hover-color #6eb3ff Dark mode hover highlight
--dark-hover-color-dark #8cc5ff Dark mode darker hover
--dark-code-bg #2a2a2a Dark mode code background
--dark-tag-bg #2a2a2a Dark mode tag background
--dark-tag-hover-bg #333 Dark mode tag hover
--dark-category-bg #1a3a4a Dark mode category background
--dark-category-hover-bg #2a4a5a Dark mode category hover
--dark-category-text #6eb3ff Dark mode category text
--dark-blockquote-border #444 Dark mode blockquote border
--dark-table-border #404040 Dark mode table borders
--dark-table-header-bg #2a2a2a Dark mode table header
--dark-table-stripe-bg #222222 Dark mode table stripe
--dark-admonition-note-title-color #58a6ff Dark note title
--dark-admonition-tip-title-color #3fb950 Dark tip title
--dark-admonition-important-title-color #a371f7 Dark important title
--dark-admonition-warning-title-color #d29922 Dark warning title
--dark-admonition-caution-title-color #f85149 Dark caution title

Example: full colour override

The following stylesheet demonstrates overriding all colour variables. It is a good starting point for building your own theme.

/* Light mode palette */
:root {
    --bg-color: #fdfdf7;
    --text-color: #222;
    --text-secondary: #6b6b6b;
    --border-color: #e4e4e0;
    --border-color-light: #edede9;
    --link-color: #c0392b;
    --link-hover-color: #96281b;
    --link-visited-color: #7b241c;
    --hover-color: #c0392b;
    --hover-color-dark: #96281b;
    --code-bg: #f2f2ed;
    --tag-bg: #eef0ed;
    --tag-hover-bg: #dde0dc;
    --category-bg: #fde8e6;
    --category-hover-bg: #fbcac7;
    --category-text: #c0392b;
    --blockquote-border: #e0d0ce;
    --table-border: #e0d0ce;
    --table-header-bg: #f2ede0;
    --table-stripe-bg: #faf9f5;
}

/* Dark mode palette — override --dark-* to change dark mode colours */
:root {
    --dark-bg-color: #1c1512;
    --dark-text-color: #ddd5cc;
    --dark-text-secondary: #9d9590;
    --dark-border-color: #3a3028;
    --dark-border-color-light: #2c2420;
    --dark-link-color: #ff8c85;
    --dark-link-hover-color: #ffada8;
    --dark-link-visited-color: #d4a0cb;
    --dark-hover-color: #ff8c85;
    --dark-hover-color-dark: #ffada8;
    --dark-code-bg: #28201c;
    --dark-tag-bg: #2c2420;
    --dark-tag-hover-bg: #3a3028;
    --dark-category-bg: #3a1e1c;
    --dark-category-hover-bg: #4a2e2c;
    --dark-category-text: #ff8c85;
    --dark-blockquote-border: #5a4040;
    --dark-table-border: #3a3028;
    --dark-table-header-bg: #28201c;
    --dark-table-stripe-bg: #201810;
}

Template customisation

For changes beyond colours — different layouts, additional elements, altered markup — you can override individual templates. See the Templates reference for full details.

Copy base.html from the BlogMore source into your templates directory and edit the <footer> block. You only need to copy the files you intend to change; BlogMore falls back to the built-in templates for everything else.

my-blog/
├── my-templates/
│   └── base.html       ← customised copy
├── posts/
└── blogmore.yaml

# blogmore.yaml
templates: my-templates

Combining templates and stylesheets

Templates and extra stylesheets work together. A common pattern is:

  • Override base.html to add an extra {% block extra_head %} section, a custom font <link>, or a sidebar widget.
  • Use a custom stylesheet to adjust colours, spacing, and typography without duplicating the entire base layout.

See Template API for the full list of context variables and stable template blocks.

Example themes

The examples/themes/ directory contains three ready-to-use themes that demonstrate different customisation approaches:

Theme Approach Description
solarized-dark/ CSS only Solarized colour scheme with warm accent tones
minimal-monochrome/ CSS only Clean grayscale with strong typographic hierarchy
modern-compact/ CSS + templates Tighter layout with custom sidebar and post summary

Each theme directory contains a README.md with installation instructions and a custom.css (and optionally custom templates) ready to copy into your blog.

Stability guarantees

All CSS custom properties documented in this guide are part of BlogMore's stable public API for v1.x releases. Specifically:

  • CSS variable names will not be renamed without a major version bump.
  • New variables may be added at any time; existing ones will not be removed.
  • The data-theme attribute values ("dark" and "light") will not change.
  • Template context variables documented in Template API will remain stable for all v1.x releases.

Any breaking change will be clearly labelled BREAKING CHANGE in ChangeLog.md and will include migration instructions.