Transparent Header Not Working on Porfolio Pages

I have my navigation header set to transparent but the black bar still appears on portfolio pages, not others pages. How can I have my images be full bleed on hover with no color on the header bar on these following two pages?

Any special CSS code i need to use?

Thanks

 Hi. Add to Design > Custom CSS

/* Fix header black bar */
body#collection-6035ce92ad9aa279501fdff1, body#collection-60557cf11f8001702f18bbbf { article section:first-child {
    padding-top: 0 !important;
}}

Thanks so much. It works perfectly!