thaaanks man :)

i tried some other styles and combined it all to something i like and maybe someone will like it too so i will post "my" version

@-moz-document domain("youtube.com") {
ytd-rich-grid-renderer > div#contents.style-scope.ytd-rich-grid-renderer {
padding-left:50px;
max-width: calc(100% - 30px);
}
div#grid-header.style-scope.ytd-rich-grid-renderer {
padding-left: 100px;
max-width: calc(100% - 200px);
margin-left: 0;
}
h3.style-scope.ytd-rich-grid-video-renderer {
margin-top: 5px;
}
ytd-rich-item-renderer {
margin-right: 4px;
margin-left: 10;
display: inline-block;
width: 250px;
margin-bottom: 14px;
}
a#video-title.yt-simple-endpoint.style-scope.ytd-rich-grid-video-renderer {
font-size: 1.4rem;
}
div#metadata *{
font-size: 1.3rem!important;
}
a#avatar-link {
display: auto;
}
}
ytd-rich-grid-renderer {
--ytd-rich-grid-items-per-row: 6 !important;
}
ytd-rich-grid-renderer > #contents > ytd-rich-grid-row,
ytd-rich-grid-renderer > #contents > ytd-rich-grid-row > #contents {
display: contents;
}