Reduce space between header and gallery section

Site URL: https://www.morganedelfosse.com/series/reparer

Hi,

I'd like to reduce the space between the header and my galleries, and between the header and my blog posts, to make it equal to the space between the header and the portfolios or text on the about and contact pages (as you see on screenshots attached).

Can you help me ?

Add to Design > Custom CSS

/* reduce space */
.gallery-slideshow {
    padding-top: 0px !important;
}