Good evening Neill and welcome back!
Thank you for reaching out to us.
We are sorry to hear about the colours not displaying correctly on your buttons.
I would love to help you with this topic.
In order to gain full power on your site’s look and feel, I would highly recommend reading the following articles:
Try adding the following CSS rule to your style.css file or in your Custom CSS metabox:
.tribe-events-tickets td.woocommerce button {color: #fff !important;}
As for the size of the quantity arrows, this is the default look of WooCommerce quantity buttons.
The good news is that there a quite a few options out there to tweak their appearance (e.g.: https://www.8theme.com/topic/quantity-button-styling-arrows/)
Let me know if that helps.
Have a great day!
Geoff B.