Title product attribute

My webshop is still offline, so I can’t show it yet.I use theme activello. I added a few variable attributes to my product, but the title of the attributes (size, color,…) is white. I also have a white background, so you can’t see them.
Where can I change the color of the title of the attributes? Tried to add some css, but it doesn’t change anything.
Thanks in advance.

I hope you are well today and thank you for your question.

You can try achieving this by adding the following CSS code in the Custom CSS option of your theme on the below path.

Admin Area -> Appearance -> Customize -> Additional CSS

/*single product information white and cost price green*/
h1.product_title.entry-title {
    color: #000000;
span.woocommerce-Price-amount.amount {
    color: #80b88d;
div.woocommerce-product-details__short-description p {
    color: #000000;

Best Regards,