.Header,
.js-new-project-column-container,
.js-show-project-triage,
.js-show-project-menu,
.js-project-fullscreen-link,
.repohead-details-container,
.reponav,
.subnav-search {
    display: none;
}

.repohead {
    padding: 0;
}

.project-column {
    min-width: 0% !important;
    width: 100% !important;
    max-width: 100% !important;
}

.project-columns {
    padding-top: 0 !important;
}

https://github.com/*/*/projects/*?fullscreen=true