Add color scheme article

src/contents/customizing-astropaper-theme-color-schemes.md

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+---
+author: Sat Naing
+datetime: 2022-09-25T15:20:35Z
+title: Customizing AstroPaper theme color schemes
+slug: ""
+featured: false
+draft: false
+tags:
+  - color-schemes
+  - docs
+ogImage: ""
+description:
+  How you can enable/disable light & dark mode; and customize color schemes
+  of AstroPaper theme.
+---
+
+This post will explain how you can enable/disable light & dark mode for the website. Moreover, you'll learn how you can customize color schemes of the entire website.
+
+## Table of contents
+
+## Enable/disable light & dark mode
+
+AstroPaper theme will include light and dark mode by default. In other words, there will be two color schemes\_ one for light mode and another for dark mode. This default behavior can be disabled in SITE configuration object of the `src/config.ts` file.
+
+```js
+// file: src/config.ts
+export const SITE = {
+  website: "https://astro-paper.pages.dev/",
+  author: "Sat Naing",
+  desc: "A minimal, responsive and SEO-friendly Astro blog theme.",
+  title: "AstroPaper",
+  ogImage: "og-default.png",
+  lightAndDarkMode: true, // true by default
+  postPerPage: 3,
+};
+```
+
+To disable `light & dark mode` set `SITE.lightAndDarkMode` to `false`.
+
+## Customize color schemes
+
+Both light & dark color schemes of AstroPaper theme can be customized. You can do this in `src/styles/base.css` file.
+
+```css
+/* file: src/styles/base.css */
+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
+@layer base {
+  :root {
+    --color-fill: 251, 254, 251;
+    --color-text-base: 40, 39, 40;
+    --color-accent: 0, 108, 172;
+    --color-card: 230, 230, 230;
+    --color-card-muted: 205, 205, 205;
+    --color-border: 236, 233, 233;
+  }
+  .theme-dark {
+    --color-fill: 47, 55, 65;
+    --color-text-base: 230, 230, 230;
+    --color-accent: 26, 217, 217;
+    --color-card: 63, 75, 90;
+    --color-card-muted: 89, 107, 129;
+    --color-border: 59, 70, 85;
+  }
+  /* other styles */
+}
+```
+
+In AstroPaper theme, **:root** is the primary (light) color scheme and **.theme-dark** is the secondary (dark) color scheme.
+
+Colors are declared in CSS custom property (CSS Variable) notation. Color property values are written in rgb values. (Note: instead of rgb(40, 39, 40), only specify `40, 39, 40`)
+
+Here is the detail explaination of color properties.
+
+| Color Property       | Definition & Usage                                         |
+| -------------------- | ---------------------------------------------------------- |
+| `--color-fill`       | Primary color of the website. Usually the main background. |
+| `--color-text-base`  | Secondary color of the website. Usually the text color.    |
+| `--color-accent`     | Accent color of the website. Link color, hover color etc.  |
+| `--color-card`       | Card and scrollbar background color.                       |
+| `--color-card-muted` | Card and scrollbar background color for hover state etc.   |
+| `--color-border`     | Border color. Especially used in horizontal row (hr)       |
+
+Here is an example of changing the primary color scheme.
+```css
+@layer base {
+  /* lobster color scheme */
+  :root {
+    --color-fill: 246, 238, 225;
+    --color-text-base: 1, 44, 86;
+    --color-accent: 225, 74, 57; 
+    --color-card: 220, 152, 145;
+    --color-card-muted: 233, 119, 106;
+    --color-border: 220, 152, 145;
+  }
+```