Hi

Seems to work

I have changed the CSS to this once

button.is-shortcode.configure-product-simple.configure-product.configurateur:hover {
background-color: black;
color: white;
margin-bottom: 20px;
}
button.is-shortcode.configure-product-simple.configure-product.configurateur {
background-color: red;
color: white;
margin-bottom: 20px;
font-size: 16px;
}