update bootstrap to version 4.3.1

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+---
+layout: docs
+title: Overflow
+description: Use these shorthand utilities for quickly configuring how content overflows an element.
+group: utilities
+---
+
+Barebones `overflow` functionality is provided for two values by default, and they are not responsive.
+
+<div class="bd-example d-md-flex">
+  <div class="overflow-auto p-3 mb-3 mb-md-0 mr-md-3 bg-light" style="max-width: 260px; max-height: 100px;">
+    This is an example of using <code>.overflow-auto</code> on an element with set width and height dimensions. By design, this content will vertically scroll.
+  </div>
+  <div class="overflow-hidden p-3 bg-light" style="max-width: 260px; max-height: 100px;">
+    This is an example of using <code>.overflow-hidden</code> on an element with set width and height dimensions.
+  </div>
+</div>
+
+{% highlight html %}
+<div class="overflow-auto">...</div>
+<div class="overflow-hidden">...</div>
+{% endhighlight %}
+
+Using Sass variables, you may customize the overflow utilities by changing the `$overflows` variable in `_variables.scss`.