Hello,

03. Please add the following Custom CSS code to Theme Settings > Custom CSS > Custom CSS for mobile.

.single_add_to_cart_button, form.cart .wd-buy-now-btn {
    width: 94px;
    font-size: 15px !important;
}

04. Attempt to upload an icon sized 20×20 pixels and ensure it’s in SVG format.

Best Regards