How do I identify lightbox form checkboxes in CSS

Site URL: https://littlegreenspace.com/contact

Hey! 🙂 just a small thing... but it would be awesome to figure out! So I have been able to identify the majority of my light-box form elements to customise, the only thing I am struggling to identify is the checkbox - to add a stroke and fill to match the the other answer boxes. Also I can't seem to edit the size of the words next to the checkboxes, only the colour! I have identified both on the image). Anybody know...?

https://littlegreenspace.com/contact

With text size, use this CSS

/* lightbox form option size */
div.lightbox-inner .option label {
    font-size: 12px !important;
}