Add Style A Background With A Linear Gradient as a css til

css/style-a-background-with-a-linear-gradient.md

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+# Style A Background With A Linear Gradient
+
+The
+[`linear-gradient`](https://developer.mozilla.org/en-US/docs/Web/CSS/linear-gradient)
+function in its simplest form can be used to style the background of an
+element with a vertical, linear gradient between two colors.
+
+<p data-height="251" data-theme-id="0" data-slug-hash="pQpypW"
+data-default-tab="result" data-user="jbranchaud" data-pen-title="pQpypW"
+class="codepen">See the Pen <a
+href="https://codepen.io/jbranchaud/pen/pQpypW/">pQpypW</a> by Josh
+Branchaud (<a href="https://codepen.io/jbranchaud">@jbranchaud</a>) on <a
+href="https://codepen.io">CodePen</a>.</p>
+<script async src="https://static.codepen.io/assets/embed/ei.js"></script>
+
+Here is what the CSS looks like:
+
+```css
+.container {
+  background: linear-gradient(#00449e, #e66465);
+}
+```
+
+The background of any element with the `container` class will be styled with
+a linear gradient that transitions from `#00449e` to `#e66465`.