Found a bug in Nova Light escort where the add to favorites button was aligned as white on a white background, these should be set as per the video.
https://screencast-o-matic.com/watch/cqQnhattfm
CSS 2490 - left 771 > left 93
+
CSS 2498 - left 793 > right 93
EDIT / UPDATE > this bug per se is because I was using 4.7.1 with the nova 4.7.2 template scrap the above fix and use the method below.
CSS 2803
.listing-header div.icons > * > span {
width: 18px;
height: 18px;
display: inline-block;
vertical-align: top;
Edit to
.listing-header div.icons > * > span {
width: 22px;
height: 20px;
display: inline-block;
vertical-align: top;
filter: invert(1);
and this will change the white on white background to black on white