Hey Cindy,
The color issue is related to your theme. Are you familiar with adding custom CSS to your site? If so, you will want to add the following CSS to get the background to display in white:
.woocommerce a.button,.woocommerce-page a.button {
background: #fff!important;
}
If you are not familiar with making these changes, can you please let me know? I will send you some further information on making these changes or attempt to make them for you? Please note, this is not an issue with our Customizer plugin, but with the theme settings. You may want to reach out to the theme developers for any further customizations.
Regarding the issue you mentioned for the login text,I believe this can be changed with Customizer, but would like to take a look. Would it be possible to share WordPress admin credentials for the site so I can take a look into this? You can find instructions here on how to add one for me.
Please send the login credentials to [email protected] so I can recover the account password.
Cheers,
Steve