feat: Circular navigation

contents/_includes/covers/circular-navigation.njk

@@ -0,0 +1,7 @@
+<div class="circular-navigation">
+    {% for i in range(0, 6) -%}
+    <div class="circular-navigation__circle circular-navigation__circle--{{ i + 1 }}">
+        <div class="circular-navigation__content">{{ i + 1 }}</div>
+    </div>
+    {%- endfor %}
+</div>

contents/circular-navigation.md

@@ -0,0 +1,73 @@
+---
+layout: layouts/post.njk
+title: Circular navigation
+description: Create a circular navigation with CSS flexbox
+keywords: css circular navigation, css flexbox
+---
+
+## HTML
+
+```html
+<div class="circular-navigation">
+    <!-- The trigger element that will show all circles when user clicks it -->
+    ...
+
+    <!-- A circle menu item -->
+    <div class="circular-navigation__circle">
+        <!-- The content -->
+        <div class="circular-navigation__content">            
+            ...
+        </div>
+    </div>
+
+    <!-- Repeat menu items -->
+    ...
+</div>
+```
+
+## CSS
+
+```css
+.circular-navigation {
+    position: relative;
+}
+
+.circular-navigation__circle {
+    /* Position */
+    position: absolute;
+    top: 0;
+
+    /*
+    3rem is the distance from the item to the trigger element.
+    Replace 0deg with 60deg, 180deg, 240deg, 300deg for another item
+    in case you want to have a total of 6 menu items.
+    The formulation is 360 / numberOfItems * indexOfItem
+    */
+    transform: rotate(0deg) translateX(-3rem);
+
+    /* Must have the same size as the trigger element */
+    height: 2rem;
+    width: 2rem;
+}
+
+.circular-navigation__content {
+    /*
+    Rotate it to make it displayed vertically
+    Replace -0deg with -60deg, -180deg, -240deg, -300deg for another item
+    in case you want to have a total of 6 menu items.
+    The formulation is -(360 / numberOfItems * indexOfItem)
+    */
+    transform: rotate(-0deg);
+
+    /* Center the content */
+    align-items: center;
+    display: flex;
+    justify-content: center;
+
+    /* Take full size */
+    height: 100%;
+    width: 100%;
+}
+```
+
+{% demo %}{% include "covers/circular-navigation.njk" %}{% enddemo %}

contents/index.njk

@@ -126,6 +126,7 @@ eleventyExcludeFromCollections: true
         <h2 class="category__name">Navigation</h2>
         <div class="category__posts">
             {% pattern "Breadcrumb" %}{% include "covers/breadcrumb.njk" %}{% endpattern %}
+            {% pattern "Circular navigation" %}{% include "covers/circular-navigation.njk" %}{% endpattern %}
         </div>
     </div>