Utilities for creating outline rings with box-shadows.
<table style="display: table;">
<thead>
<tr>
<th style="text-align: center;">Class</th>
<th style="text-align: center;">Properties</th>
</tr>
</thead>
<tbody>
<tr><td>ring-<i><integer></i></td><td>box-shadow: 0 0 0 calc(<i><integer></i>px + var(--en-ring-offset-width)) var(--en-ring-color);</td></tr>
<tr><td>inset-ring-<i><integer></i></td><td>box-shadow: inset 0 0 0 calc(<i><integer></i>px + var(--en-ring-offset-width)) var(--en-ring-color);</td></tr>
</tbody>
</table>
### Tailwind compatibility
Ring width values don't follow Tailwind's philosophy of limiting possible values and all
numbers are supported. They are however perfectly compatible with Tailwind's values.
### Arbitrary values
Any [`<length>`](crate::utils::value_matchers::is_matching_length) property is allowed as arbitrary value.
For example, `ring-[1.2rem]`.
[Tailwind reference](https://tailwindcss.com/docs/ring-width)