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The border-red-900 class is not a valid class in Tailwind CSS. The valid border color classes in Tailwind CSS are border-{color}-100 to border-{color}-900, where {color} can be any of the valid color names or hex codes.
To set a red border, you can use the border-red-500 class, which sets the border color to the default shade of red in Tailwind CSS.
Example:
<div class="border border-red-500">This element has a red border</div>