Stylish userstyle that restores the old StackOverflow navigation bar theme, more or less

old-stackoverflow-theme.css

/**
 * Stackoverflow decided to change the navigation bar styling on 14th February 2017.
 * This userstyle attempts to restore the old navigation bar feel with some of my
 * subjective styling preferences thrown in
 *
 * Userstyles: https://userstyles.org/
 * Relevant: http://meta.stackoverflow.com/questions/343653/top-navigation-update
 * Original: https://userstyles.org/styles/138640/stack-black-slim-header
 *
 *
 * CHANGELOG:
 *
 * + [Saturday] Sep 23, 2017 23:53
 *   - Stackoverflow renamed the top header to "top-bar" from "so-header"
 *   - Remove the salary calculator button experiment
 *
 */
@-moz-document domain("stackoverflow.com") {

  .top-bar~.container {
    padding-top: 37px;
  }

  .top-bar {
    border-top: none;
    background-color: #333;
    height: 35px;
    position: inherit !important;
  }

  .top-bar .-container {
    max-width: none;
    width: auto;
    padding-left: 40px;
    padding-right: 40px
  }

  .top-bar .-logo {
    height: 36px
  }

  .f-input.js-search-field {
    font-size: 13px !important;
  }

  .top-bar .navigation .-link {
    color: #aaa;
    font-size: 13px;
  }

  .top-bar .navigation .-item._current .-link,
  .top-bar .my-profile .-rep {
    color: #bbb;
    border-bottom: none;
  }

  .top-bar .navigation .-item._current .-link {
    color: white;
  }

  .top-bar .navigation .-link:hover {
    background-color: #333;
    color: white;
  }

  .top-bar .-logo:hover,
  .top-bar .secondary-nav .-item .-link.topbar-icon-on,
  .top-bar .secondary-nav .-item._active,
  .top-bar .secondary-nav .-item .-link:hover {
    background-color: #3B4045;
  }

  .top-bar [role="icon"] {
    fill: #848D95 !important;
  }

  .top-bar .indicator-badge {
    border: none;
    font-weight: bold;
    font-size: 11px;
  }

  .top-bar .js-review-button .indicator-badge {
    background-color: #24a;
  }

  .top-bar .secondary-nav .-link .indicator-badge:not(._regular),
  .top-bar .secondary-nav .-link:hover .indicator-badge,
  .top-bar .secondary-nav .-link .indicator-badge {
    top: 2px !important;
    right: -4px;
    z-index: 99;
  }

  .top-bar [role="icon"] {
    fill: #555;
  }

  .top-bar .navigation .-link:hover {
    background-color: #3B4045;
    color: white;
  }

  .top-bar .my-profile:hover {
    background-color: #3B4045;
  }

  .top-bar .navigation .-item:nth-child(2),
  .adzerk-vote,
  [id^='adzerk'] {
    display: none
  }

  .top-bar .navigation .-list,
  .top-bar .navigation .-link,
  .top-bar .secondary-nav .-list,
  .top-bar .secondary-nav .-link {
    height: 36px;
    line-height: 36px
  }

  .top-bar .my-profile {
    padding-top: 6px;
    padding-bottom: 6px
  }

  .top-bar .searchbar input[type="text"].f-input {
    height: 24px;
    padding-left: 32px;
    background-color: #222;
    border: none;
    color: #aaa;
  }

  .top-bar .searchbar input[type="text"].f-input:hover {
    color: #bbb;
  }

  .top-bar .searchbar input[type="text"].f-input:focus {
    color: white;
    background-color: #444;
    box-shadow: none;
  }

  .top-bar .js-search-submit {
    background-color: #666 !important;
    border-color: #444 !important;
    height: 24px !important;
    min-height: 24px !important;
    box-shadow: none;
    padding: 2px 8px !important;
  }

  .top-bar .js-search-submit svg {
    fill: white;
  }

  .top-bar .searchbar>[role="icon"] {
    left: 20px
  }

  .top-bar .navigation .beta-badge {
    top: 24px;
    color: #777;
    font-weight: bold;
  }

  .top-bar .navigation li:hover .beta-badge {
    color: #aaa;
  }

  /** Don't fold long code sections */
  pre {
    max-height: none;
  }

  /** Hide that annoying welcome back message */
  #herobox,
  #question .everyonelovesstackoverflow {
    display: none !important;
  }

  /** The badge ruins the styling a bit */
  .beta-badge {
    display: none;
  }

  /**
   * Hides the new dark logo text that just slightly disappears in the dark
   * background
   *
   * New sprite logo as of February 24, 2017
   */
  .top-bar .-logo .-img {
    background-position: 0 -500px !important;
    width: 29px !important;
  }

  #noscript-warning {
    font-family: Calibri;
    position: absolute;
    top: 35px;
  }

  /* Advert */
  .clc-cp-container {
    display: none !important;
  }

  /* Hide that new calculate salary button */
  .top-bar .-feature-notice {
    display: none !important;
  }

  /* Remove the padding between the top header and the question title */
  .top-bar~.container,
  .container._full #content .inner-content
  {
    padding: 0px !important;
  }

  #left-sidebar {
    display: none;
  }

  body > .container {
    margin-left: 0px !important;
  }

  #content {
    margin-left: 80px !important;
  }

  body {
    padding-top: 0px !important;
  }

}