Try to add the following code snippet to the Custom CSS area in Theme Settings to fix this issue.
.woocommerce-message, .wpcf7-mail-sent-ok {
border-color: #e0bcc9;
color: #e0bcc9;
}
.woocommerce-message .button {
background-color: #e0bcc9;
border-color: #e0bcc9;
}
.woocommerce-message .button:hover {
background-color: #e0bcc9;
border-color: #e0bcc9;
}
.woocommerce-error, .woocommerce-info, div.wpcf7-validation-errors {
color: #e0bcc9;
border-color: #e0bcc9;
}
Regards