The ring-4 class belongs to the ring width group within the borders category.
Here is an example of how to use ring-4:
<input type='text' class='ring-4 ring-indigo-500 ring-offset-2 ring-offset-amber-500'>
--tw-ring-offset-shadow: var(--tw-ring-inset) 0 0 0 var(--tw-ring-offset-width) var(--tw-ring-offset-color); --tw-ring-shadow: var(--tw-ring-inset) 0 0 0 calc(4px + var(--tw-ring-offset-width)) var(--tw-ring-color); box-shadow: var(--tw-ring-offset-shadow), var(--tw-ring-shadow), var(--tw-shadow, 0 0 #0000);
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