Forms text disappeared

The text on my forms has disappeared (both WP Forms and native). WordPress support provided me with some CSS as a temporary fix, but they believe it is something in the theme:

/* make contact form label visible 24665243-hc rs */
.contact-form label {
color: #000;
}

div.wpforms-container-full .wpforms-form .wpforms-field-label {
color: #000;
}

Did something in the theme change, or is there a setting I need to change to make the form text appear?