Make all kinds of things stick to the edges of the screen on GitHub

sticky.css

.file-header,
.discussion-sidebar,
.dashboard-sidebar,
.comment-reactions,
/* .commit-tease, */
.review-thread-reply,
.user-profile-repo-filter,
.timeline-comment-header,
#wiki-rightbar,
.table-list-header,
/* #readme > h3, */
.release-meta,
.release-header,
.codesearch-aside,
.issues-listing.container .subnav,
#org-repositories>:last-child {
  position: -webkit-sticky;
  position: sticky;
}

.release-header,
.discussion-sidebar,
.org-profile .user-profile-repo-filter,
.timeline-comment-header {
  top: 0;
}
.comment-reactions,
.review-thread-reply {
  bottom: 0
}

.user-profile-repo-filter,
.comment-reactions,
.release-header {
  background: white;
}
.comment-reactions,
.user-profile-repo-filter {
  z-index: 1;
}
.dashboard-sidebar,
.codesearch-aside,
#wiki-rightbar {
  top: 16px;
}

/* .commit-tease, */
/* #readme > h3, */
.file-header,
.table-list-header {
  top: -3px;
  z-index: 50;
}
/*
.user-profile-repo-filter {
  background: rgba(255, 255, 255, 0.5);
  -webkit-backdrop-filter: blur(10px);
          backdrop-filter: blur(10px);
}*/

#org-repositories>:last-child {
  top: 83px;
}
.user-profile-repo-filter {
  top: 62px;
}
.org-profile .user-profile-repo-filter {
  padding-top: 16px;
  margin-top: -16px;
}

.release-meta {
  top: -40px;
  padding-top: 50px;
}

@supports (-webkit-backdrop-filter: blur(10px)) or (backdrop-filter: blur(10px)) {
  .pagehead,
  .orghead {
    padding-top: 74px;
  }
  #notification-center,
  .issues-listing.container .subnav,
  #dashboard {
    padding-top: 54px;
  }
  .header {
    background: hsla(0, 0%, 94%, 0.5);
    position: fixed;
    top: 0;
    z-index: 10000;
    width: 100%;
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid #e5e5e5;
  }
  .release-header,
  .discussion-sidebar,
  .org-profile .user-profile-repo-filter,
  .timeline-comment-header {
    top: 54px;
  }
  .dashboard-sidebar,
  .codesearch-aside,
  #wiki-rightbar {
    top: calc(16px + 54px);
  }
  .file-header,
  .table-list-header {
    top: calc(54px - 3px);
  }
  #org-repositories>:last-child {
    top: calc(54px + 83px);
  }
  .user-profile-repo-filter {
    top: calc(54px + 62px);
  }
  .release-meta {
    top: calc(54px - 40px);
  }
}