Change pop-up background colour

Hi there,

Is there a way to change the background colour behind my text for pop-ups on both desktop and mobile? Ideally I would like black background with white text.

URL: www.thompsonlane.com.au

PW: 'tellyourstory'

Popup will appear after 30 seconds. 

Thank you,

Cas

You can add this code to Website Tools (under Not Linked) > Custom CSS

.sqs-slice-group.group-copy.copy-layer-background {
    background-color: black !important;
}

.sqs-slice-group.group-copy.copy-layer-background * {
    color: white !important;
}

a.sqs-popup-overlay-close {
    color: white !important;
}