Styling Timely Booking Button

Hey all,

I'm trying to style my Timely booking buttons to match the native ones on my website but cannot for the life of me figure out the handle that I need to be using to access via css. Any help would be appreciate. Here is a page with both the Timely button and a native one with the styling.

https://elysiantattoo.co/booking-test

Thanks!

@Elysian

Book Now button is image...

Use this code to change button image

div#block-yui_3_17_2_1_1575769334236_3753 a {
    background-image: url(https://beaverhero.com/wp-content/uploads/2019/07/coffee-beans-1082116_640-min.jpg) !important;
    border-radius: 4px;
}