The default theme of Quire: plain semantic HTML and CSS, no JavaScript, responsive, with a light and a dark look that follows the visitor's system setting. It meets WCAG 2.2 AA, writes right-to-left languages mirrored, and comes in English and German.
New Quire sites use it already. To use it again after switching:
bin/console quire:theme:use quire-theme-defaultSettings: theme.quire-theme-default.accent (blue, green, purple, orange or red) and theme.quire-theme-default.show_dates.
To build your own look on it, make a child theme with "theme": {"parent": "quire-theme-default"} in extra.quire, add a stylesheet that overrides its CSS custom properties, and override the templates you want to change. Each template starts with a comment listing its variables, blocks and slots. See the theme documentation.
License: MIT.