don't judge. very hacky.

github3.css

/* ==UserStyle==
@name        GitHub Fixes
@description This is your new file, start writing code
@match       https://github.com/*
==/UserStyle== */

/* Compact style for new issues page */
div:has(>div[aria-labelledby="view-title"]) {
  padding: 0px 8px;
}

ul[aria-labelledby*="list-view-container-title"] > div > li[role="listitem"] {
  grid-template-areas:
    "selection status primary      primary  actions"
    "selection status main-content metadata actions";
}

ul[aria-labelledby*="list-view-container-title"] > div > li[role="listitem"] > div:has(>div>div>div>svg) {
  padding-left: 4px;
}

ul[aria-labelledby*="list-view-container-title"] > div > li[role="listitem"] > div > div:has(relative-time) {
  padding-top: 0px;
  padding-bottom: 0px;
  justify-content: center;
}

div[data-target="react-app.reactRoot"] > div > div > div > div:has(h2[class~="sr-only"]) {
  padding: 0px 8px;
}

div[data-target="react-app.reactRoot"] > div > div > div > div:has(div[data-hpc="true"]) {
  padding: 0px 8px;
}

/* Reduce padding in markdown content */
div[data-target="react-app.reactRoot"] div:has(>div[class~="markdown-body"]) {
  padding: 6px;
  margin: 0px;
}

/* Timeline stuff */
section[aria-label="Events"] div:has(>div>div>section) {
  padding-right: 8px;
}

/* Compact style for new commit page on mobile */
code > div {
  white-space: pre !important;
  word-wrap: normal !important;
  overflow: unset !important;
}

div:has(>table code) {
  overflow: auto !important;
}

table:has(>colgroup>col[width="100%"]) {
  width: auto !important;
}

div[data-target="react-app.reactRoot"] > div > div > div > div:has(div[data-hpc="true"]) {
  padding: 0px;
}

/* Fixes for current PR File Changes view */
turbo-frame > div[class~="clearfix"] {
  padding-left: 0px !important;
  padding-right: 0px !important;
}

turbo-frame > div > div[class~="clearfix"] {
  padding-left: 0px !important;
  padding-right: 0px !important;
}

.js-blob-wrapper {
  overflow-x: auto !important;
  isolation: isolate;
}

.blob-code-inner {
  white-space: pre !important;
}

.blob-num {
  width: 30px;
  min-width: 30px;
}

/* blob view */
div:has(>div>div>div>section) {
    margin-left: 2px !important;
    margin-right: 2px !important;
}

#copilot-button-positioner {
    padding: 0px !important;
    margin: 0px !important;
}

.react-line-numbers {
    width: 58px !important;
    min-width: 58px !important;;
}

.react-code-line-contents {
    padding-left: 0px !important;;
    padding-right: 0px !important;;
}

textarea[class~="react-blob-textarea"] {
    padding-left: 68px !important;
    padding-right: 0px !important;
}

.code-navigation-cursor {
    display: none;
}