adds wrapper documentation

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+---
+title: Wrapper
+description: Wrapper creates the necessary structure to wrap elements so that full width backgrounds can applied.
+tags:
+  - full width
+  - fliud
+  - header
+  - footer
+---
+
+## Basics
+
+When using [Inky](inky.html) HTML, the `<wrapper>` tag will create a `<table>`, `<tr>`, `<th>` structure needed to create consistant full width backgrounds. You can add classes to the wrapper to targed CSS properties on it or target elements within it. The `.wrapper-inner` class is available to add padding to the wrapper.
+
+```inky_example
+<wrapper>
+  content
+</wrapper>
+```
+
+## Full (fluid) width header or footer
+
+Creating a fluid header with the `<wrapper>` component is pretty straight forward. Wrapping a `<container>` will keep your content bound to the width of the container. Add a class to the `<wrapper class="">` to add a background color.
+
+```inky_example
+<style type="text/css">
+  .header {
+    background: #8a8a8a;
+  }
+
+  .header .columns {
+    padding-bottom: 0;
+  }
+
+  .header p {
+    color: #fff;
+    padding-top: 15px;
+  }
+
+  .header .wrapper-inner {
+    padding: 20px;
+  }
+
+  .header .container {
+    background: transparent;
+  }
+</style>
+
+<wrapper class="header">
+  <container>
+    <row class="collapse">
+      <columns small="6">
+        <img src="http://placehold.it/200x50/663399">
+      </columns>
+      <columns small="6">
+        <p class="text-right">HEADER</p>
+      </columns>
+    </row>
+  </container>
+</wrapper>
+```
+
+Using this structure outside of the container will yeild a fluid width background that expands to the width of the email client's viewport.
+
+