Add background pattern snippets

snippets/zig-zag-pattern.md

@@ -0,0 +1,30 @@
+---
+title: Stripes background pattern
+tags: visual,advanced
+---
+
+Creates a stripes background pattern.
+
+- Use `background-color` to set a white background.
+- Use `background-image` with four `linear-gradient()` values to create the parts of a zig zag pattern.
+- Use `background-size` to specify the pattern's size and `background-position` to place the parts of the pattern in the correct locations.
+- **Note:** The fixed `height` and `width` of the element is for demonstration purposes only.
+
+```html
+<div class="zig-zag"></div>
+```
+
+```css
+.zig-zag {
+  width: 240px;
+  height: 240px;
+  background-color: #fff;
+  background-image: linear-gradient(135deg, #000 25%, transparent 25%),
+    linear-gradient(225deg, #000 25%, transparent 25%),
+    linear-gradient(315deg, #000 25%, transparent 25%),
+    linear-gradient(45deg, #000 25%, transparent 25%);
+  background-position: -30px 0, -30px 0, 0 0, 0 0;
+  background-size: 60px 60px;
+  background-repeat: repeat;
+}
+```