You can customize the color of buttons and other elements of WooCommerce website beautifully using built-in WordPress theme customizer.
WooCommerce Colors is a free WordPress plugin that enables you to easily change the default colors of WooCommerce elements.
Start by installing it in your WooCommerce website
Upon activation visit your admin area dashboard Appearance -> Customize to edit the colors. it provides you an easy tool if you just want WooCommerce buttons and labels to match your WordPress theme.