Hi @thetomas88,
Thank you for reaching out to us.
Try this CSS code:
.sticky-active .site-branding > a {
background-image: url('https://yourwpsite.com/path/to/your/logo.png');
}
.sticky-active .site-branding > a {
display: inline-block;
width: 309px;
height: 75px;
backround-size: cover;
background-repeat: no-repeat;
}
.sticky-active .site-branding > a img {
opacity: 0;
}
Add it to your site’s Additional CSS, which is located under Appearance > Customize menu.
Do not forget to supply your sticky logo image by replacing https://yourwpsite.com/path/to/your/logo.png in the code above with link to your image file, which is uploaded to your site’s Media Library (under Dashboard > Media).