feat: adjust float btn for dark mode

src/components/ChooseFood.vue

@@ -125,8 +125,8 @@ const { isVisible, show } = useInvisibleElement(recipePanel)
       v-show="displayedRecipe.length !== recipe.length && isVisible"
       ref="recipeBtn"
       class="cursor-pointer fixed inline-flex justify-center items-center rounded rounded-full shadow hover:shadow-md"
-      bg="green-50" w="10" h="10" bottom="4" right="4"
-      text="green-600"
+      bg="green-50 dark:green-900" w="10" h="10" bottom="4" right="4"
+      text="green-600 dark:green-300"
       @click="show"
     >
       <span v-if="displayedRecipe.length">