Squarespace now adds in a popup to notify visitors of the cookie policy due to GDPR. The text can be customized but the button always says "CONTINUE". There are no current stylizing for it, so below is how to style it to fit on the site.
You can enable to the cookie banner in Squarespace by going to:
SETTINGS > Cookies & Visitor Data > Enable Cookie Banner
CSS
@cookie-background: rgba(0,0,0,.8);
@cookie-button: #eb5a34;
.cookie-notice {background: @cookie-background!important; color: white!important; border: 0px!important; width: 97.2%; top: 85%!important; bottom: 0px; position: fixed!important; display: inline;}
.cookie-notice p {width: 90%}
.accept {padding: 5px 20px!important; text-transform: uppercase; letter-spacing: 2px; border: 2px solid @cookie-button; color: @cookie-button; background: rgba(0,0,0,.0); margin-top: -70px!important; margin-left: 5%; position: absolute; right: 8%!important;}
@media screen and (max-width: 840px) { .cookie-notice {top: 75%!important; line-height: 1.2em;} .accept {margi