Hello,

Please add this code to the Theme Settings > Custom CSS > Mobile:

body .wd-add-btn-replace .add-to-cart-loop:before,
body .wd-add-btn-replace .add-to-cart-loop:after{
	  color: transparent;
    content: "";
    width: 40px;
    height: 40px;
    background-image: url(https://www.rossetticasalinghi.com/wp-content/uploads/2020/09/Shopping_Bag-Icon.svg);
    background-position: center center;
    background-size: contain;
    background-repeat: no-repeat;
}
body .woodmart-hover-quick .woodmart-add-btn > a{
background-color:transparent; 
}

Best Regards