Merge pull request #122 from webop/master --force-build

Add button border animation snippet

snippets/button-border.md

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+### Button border animation
+
+Creates a border animation on hover.
+
+#### HTML
+
+```html
+<div class="button-border">
+  <button class="button">Submit</button>
+</div>
+```
+
+#### CSS
+
+```css
+.button {
+  background-color: #c47135;
+  border: none;
+  color: #ffffff;
+  outline: none;
+  padding: 12px 40px 10px;
+  position: relative;
+}
+.button:before,
+.button:after {
+  border: 0 solid transparent;
+  transition: all 0.25s;
+  content: '';
+  height: 24px;
+  position: absolute;
+  width: 24px;
+}
+.button:before {
+  border-top: 2px solid #c47135;
+  left: 0px;
+  top: -5px;
+}
+.button:after {
+  border-bottom: 2px solid #c47135;
+  bottom: -5px;
+  right: 0px;
+}
+.button:hover {
+  background-color: #c47135;
+}
+.button:hover:before,
+.button:hover:after {
+  height: 100%;
+  width: 100%;
+}
+```
+
+#### Demo
+
+#### Explanation
+
+Use the `:before` and `:after` pseduo-elements as borders that animate on hover.
+
+#### Browser support
+
+<span class="snippet__support-note">✅ No caveats.</span>
+
+<!-- tags: animation -->
+<!-- date: 2018-10-30 -->