Wordpress add to cart is by default disabled need to be enabled

Question

I am using woocommerce for my store. I have added custom add to cart button because of variable product using hook.

add_action( 'woocommerce_single_variation', 'spvs_loop_variation_add_to_cart_button', 20 );

function remeo_loop_variation_add_to_cart_button() {
    global $product;
 
    ?>
<div class="woocommerce-variation-add-to-cart variations_button">
    <input type="submit" class="single_add_to_cart_button button" value='<?php echo esc_html( "ADD TO BASKET" ); ?>'>
    <input type="hidden" name="add-to-cart" value="<?php echo absint( $product->get_id() ); ?>" />
    <input type="hidden" name="product_id" value="<?php echo absint( $product->get_id() ); ?>" />
    <input type="hidden" name="variation_id" class="variation_id" value="0" />
</div>
<?php
}

But when I inspect the code from the front-end of my store I got the add_to_cart button disabled.

<div class="woocommerce-variation-add-to-cart variations_button woocommerce-variation-add-to-cart-disabled">
    <input type="submit" class="single_add_to_cart_button button disabled wc-variation-selection-needed" value="ADD TO BASKET">
    <input type="hidden" name="add-to-cart" value="834">
    <input type="hidden" name="product_id" value="834">
    <input type="hidden" name="variation_id" class="variation_id" value="0">
</div>

How do I enable the button? I tried not found any solution. I need this help. My Store

Thanks in advance.