always showing add to cart button even before variations are selected

Hi,
On product pages of variable products woocommerce does not show a clickable add to cart button before the variations are selected, but just a button in a dull and lighter color.
If customers click on it before variations are selected they get an error message.
This is not ideal for ux experience and conversions.
I want the button to be immediately clickable and to show up in the page in its original color.
Do you know if there is a workaround, a snippet of code which allows me to achieve this result?
Thanks for your help