This is May from Shopify.
I've had a look into your store, and it looks like you have managed to change your font colour to white.
For future reference, if you are using a theme made and supported by Shopify, our theme developers may be able to look into making this change if your account is eligible! Feel free to contact our support to get started. Alternatively, to do it your own, you can edit your theme code, usually editing your 'theme.scss.liquid' file to change the styling using CSS. If you are not comfortable with making this change, I highly suggest reaching out to our Shopify Experts.
Let me know if you have any follow-up questions!