How to change border color of shop button

Hi there,

This CSS code is currently setting the border width and color:

button, html input[type="button"], input[type="reset"], input[type="submit"], a.button, a.button:visited, .woocommerce a.button, .woocommerce a.button:visited, .woocommerce button.button, .woocommerce input.button, .woocommerce .coupon .button {
    border-width: 1px;
    border-style: solid;
    border-color: inherit;
}

I can't tell where it's added as you are using a caching plugin but check Additional CSS field in the customizer.

Let me know if this helps :)