initial dark-mode config

docs/doc-styles.css

@@ -1,3 +1,10 @@
+body.dark {
+    --body-bg-color: #000;
+    --font-color: #f5f5f5;
+    --color-grey: #ccc;
+    --color-darkGrey: #aaa;
+}
+
 body>.container {
     max-width: 720px;
 }
@@ -26,6 +33,10 @@ body>footer {
     padding: 4rem;
 }
 
+body.dark>footer {
+    background-color: #1a1a1a;
+}
+
 section {
     margin: 5rem auto;
 }

docs/index.html

@@ -9,6 +9,7 @@
   <title>chota - A micro CSS framework</title>
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <link rel="stylesheet" href="https://unpkg.com/chota">
+  <!-- <link rel="stylesheet" href="./dist/chota.css"> -->
   <link rel="stylesheet" href="./doc-styles.css">
   <link rel="icon" type="image/png" href="favicon.png" />
 </head>
@@ -26,6 +27,15 @@
         <a href="#start">start</a>
         <a href="#docs">docs</a>
         <a href="https://github.com/jenil/chota">GitHub</a>
+        <a 
+          href="javascript:void(0)"
+          onclick="
+            const bodyClass = document.body.classList;
+            bodyClass.contains('dark')
+              ? (this.innerHTML = '☀️', bodyClass.remove('dark'))
+              : (this.innerHTML = '🌙', bodyClass.add('dark'));
+          "
+        >☀️</a>
       </nav>
     </div>
 
@@ -38,6 +48,7 @@
         <li>🌈&nbsp; Easy to <a href="#customizing">extend</a> with CSS variables</li>
         <li>🎲&nbsp; Comes with a handful of <a href="#components">components</a> &amp; <a href="#utilities">utilities</a></li>
         <li>✅&nbsp; Good Semantics</li>
+        <li>🌙&nbsp; Easy Dark Mode switch</li>
         <li>🤡&nbsp; Supports <a href="#icons">icons</a> out-of-the-box</li>
       </ul>
     </section>
@@ -107,6 +118,24 @@
 }
 
 /* Other styles..... */
+{% endhighlight %}
+<br>
+<p>Addtionally, you can add dark mode to you site, to support devices that prefer dark mode.</p>
+{% highlight html %}
+  <style>
+    body.dark {
+      --body-bg-color: #000;
+      --font-color: #f5f5f5;
+      --color-grey: #ccc;
+      --color-darkGrey: #aaa;
+    }
+  </style>
+  <script>
+    if (window.matchMedia &&
+        window.matchMedia('(prefers-color-scheme: dark)').matches) {
+      document.body.classList.add('dark');
+    }
+  </script>
 {% endhighlight %}
     </section>
     <section id="components">

src/_base.css

@@ -1,4 +1,5 @@
 :root {
+  --body-bg-color: #ffffff;
   --color-primary: #14854F;
   --color-lightGrey: #d2d6dd;
   --color-grey: #747681;
@@ -8,6 +9,7 @@
   --grid-maxWidth: 120rem;
   --grid-gutter: 2rem;
   --font-size: 1.6rem;
+  --font-color: #333333;
   --font-family-sans: -apple-system, BlinkMacSystemFont, Avenir, "Avenir Next",
     "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", "Fira Sans",
     "Droid Sans", "Helvetica Neue", sans-serif;
@@ -27,8 +29,10 @@ html {
 }
 
 body {
+  background-color: var(--body-bg-color);
   line-height: 1.6;
   font-size: var(--font-size);
+  color: var(--font-color);
   font-family: "Segoe UI", "Helvetica Neue", sans-serif; /*fallback*/
   font-family: var(--font-family-sans);
   margin: 0;

src/_card.css

@@ -1,8 +1,8 @@
 .card {
     padding: 1rem 2rem;
     border-radius: 4px;
-    background: white;
+    background: var(--body-bg-color);
-    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
+    box-shadow: 0 1px 3px var(--color-grey);
 }
 
 .card p:last-child {