Update the dark style for the textarea component.

lib/decentralised_book_index_web/components/core_components.ex

@@ -418,7 +418,7 @@ defmodule DecentralisedBookIndexWeb.CoreComponents do
         id={@id}
         name={@name}
         class={[
-          "mt-2 block w-full rounded-lg text-zinc-900 focus:ring-0 sm:text-sm sm:leading-6 min-h-[6rem]",
+          "mt-2 block w-full rounded-lg text-zinc-900 focus:ring-0 sm:text-sm sm:leading-6 min-h-[6rem] dark:bg-gray-700 dark:border-gray-600 dark:placeholder-gray-400 dark:text-white dark:focus:ring-blue-500 dark:focus:border-blue-500",
           @errors == [] && "border-zinc-300 focus:border-zinc-400",
           @errors != [] && "border-rose-400 focus:border-rose-400"
         ]}