Poggit dark userstyle - Load it via custom css extension i.e. https://github.com/openstyles/stylus

poggit-dark.css

/* ==UserStyle==
@name         Poggit Dark
@version      1.0.6
@description  Dark theme for Poggit, a GitHub application for managing PocketMine-family plugins, and website for sharing plugins
@namespace    XenialDan
@author       XenialDan
@homepageURL  https://gist.github.com/thebigsmileXD/ed07c6bd4285614d2c5654c9dce76bf2
@supportURL   https://gist.github.com/thebigsmileXD/ed07c6bd4285614d2c5654c9dce76bf2
@updateURL    https://raw.githubusercontent.com/StylishThemes/StackOverflow-Dark/master/stackoverflow-dark.user.css
==/UserStyle== */
* {
  border-radius: initial !important;
}
body {
  background-color: #222222;
  color: white;
}
.projects-header {
  background-color: #333a42;
  text-align: center;
  padding: 5px 0px;
}
.action {
  background-color: #21b9ff;
  padding: 1px 5px 2px;
  line-height: inherit;
  margin: 0px 3px;
  margin-top: 2px;
}
.action:hover {
  background-color: #4183c4;
}
.btn {
  background-color: #21b9ff;
  border: none;
}
.btn:hover {
  background-color: #4183c4;
}
.projects-latest-builds {
  margin: initial;
  background-color: #25272a;
}
.projects-wrapper {
  margin: 2px;
}
a {
  color: #21b9ff;
}
a:hover {
  text-decoration: underline;
}
:not(sup) .hover-title {
  color: white;
}
img.gh-logo {
  border-radius: 100% !important;
  border: 1.5px solid white;
  width: 19px;
  background: white;
}
.projects-header h3 > img {
  width: 20px;
  vertical-align: baseline;
}
select,
input[type="text"] {
  color: #c0c0c0;
  border: none;
  vertical-align: middle;
  background-color: #25272a;
}
input[type="text"] {
  padding: 6px 8px;
}
select::-ms-expand {
  display: none;
}
/*select {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
}*/
select,
.inline-select {
  margin: 0px;
  padding: 3px 20px 2px 8px;
  margin-top: 2px;
}
#ci-project-info-table td,
#ci-project-info-table th {
  border: 2px solid #333a42;
}
#ci-project-info-table tr:nth-child(2n) {
  background-color: #343434;
}
#ci-project-history-table td,
#ci-project-history-table th {
  border: 2px solid #333a42;
}
#ci-project-history-table tr:nth-child(2n+1) {
  background-color: #343434;
}
code,
pre code {
  padding: .2rem .4rem !important;
  color: ghostwhite;
  background-color: #343434;
  border-radius: .25rem !important;
}
.brief-info {
  background-color: #25272a;
  margin: 0px;
}
.repo-toggle {
  background-color: #333a42;
  padding: initial;
}
.repo-toggle > h5 {
  text-align: center;
  line-height: 1.7;
  margin-bottom: initial;
}
.repo-toggle > nobr {
  text-align: center;
  padding: 0px 10px 10px 10px;
}
.paginate-pagination ul > li > a.page {
  background: #25272a;
  border: none;
  color: white;
}
.paginate-pagination ul > li > a.page.active {
  background-color: #4183c4;
}
.paginate-pagination ul > li > a.page:not(.active):hover {
  background-color: #333;
}
.plugin-entry {
  background-color: #25272a;
  border: none;
}
.plugin-index .plugin-entry .plugin-entry-block.plugin-icon {
  background-color: #333a42;
}
.ui-widget-content {
  background: #333a42;
  color: inherit;
}
.remark {
  color: inherit;
}
.alert-warning {
  background-color: #fcf8e3;
  border-color: #faf2cc;
  color: #8a6d3b;
}
.ui-tabs {
  padding: 0px;
}
.ui-widget.ui-widget-content {
  border: none;
}
.ui-widget-header {
  background: #25272a;
  border: none;
}
.ui-tabs .ui-tabs-nav {
  padding: 0px;
}
.ui-tabs .ui-tabs-nav li.ui-tabs-active {
  margin-bottom: 0px;
  padding-bottom: 0px;
}
.ui-tabs .ui-tabs-nav li {
  margin-left: 0px;
  margin-right: 0px;
  border: none;
  background-color: #25272a;
}
.ui-tabs .ui-tabs-nav li:hover {
  background-color: #333;
}
.ui-state-default a,
.ui-state-default a:link,
.ui-state-default a:visited,
a.ui-button,
a:link.ui-button,
a:visited.ui-button,
.ui-button {
  color: white;
}
.ui-state-active,
.ui-widget-content .ui-state-active,
.ui-widget-header .ui-state-active,
a.ui-button:active,
.ui-button:active,
.ui-button.ui-state-active:hover {
  border: none;
  background-color: #4183c4 !important;
}
.account-tab {
  overflow: auto;
}
.ui-widget-content a {
  color: #21b9ff;
}
.submotto {
  color: white;
  font-weight: bold;
}
.wrapper-header {
  background-color: #25272a !important;
  margin-left: 10px !important;
}
.plugin-info {
  background-color: #25272a;
}
.plugin-info-description {
  background-color: #333a42;
}
.plugin-info-wrapper {
  background-color: #333a42;
}
.plugin-info-shields {
  background-color: #333a42;
}
.plugin-info-changelog {
  background-color: #333a42;
}
hr {
  border: 1px solid #323840;
}
.review-outer-wrapper {
  background-color: #323941;
  margin: 5px 0px;
  padding: 10px 10px 0 10px;
}
.review-panel {
  border: none;
}
.review-panel::before {
  content: "Reviews";
  font-size: 1rem;
  margin-bottom: .5rem;
  font-family: inherit;
  font-weight: 500;
  line-height: 1.1;
  color: inherit;
}
.review-replies {
  padding: 5px 0px 5px 15px;
}
.resptable-col {
  display: initial;
  padding-right: initial;
  margin-right: 20px;
}
.multisearch {
  margin-right: 20px;
}
.toggle-wrapper {
  background-color: #25272a;
}
.toggle-light .toggle-blob {
  background: #4183c4;
  border: 1px solid #0275c7;
}
.toggle-light .toggle-off,
.toggle-light .toggle-select .toggle-on {
  background: #f76150;
  color: initial;
}
.toggle-light .toggle-on,
.toggle-light .toggle-select .toggle-inner .active {
  background: #8ddb8d;
  color: initial;
}
.toggle-light .toggle-slide {
  box-shadow: initial;
}
* {
  border-radius: initial !important;
}
body {
  background-color: #222222;
  color: white;
}
.projects-header {
  background-color: #333a42;
  text-align: center;
  padding: 5px 0px;
}
.action {
  background-color: #21b9ff;
  padding: 1px 5px 2px;
  line-height: inherit;
  margin: 0px 3px;
  margin-top: 2px;
}
.action:hover {
  background-color: #4183c4;
}
.btn {
  background-color: #21b9ff;
  border: none;
}
.btn:hover {
  background-color: #4183c4;
}
.projects-latest-builds {
  margin: initial;
  background-color: #25272a;
}
.projects-wrapper {
  margin: 2px;
}
a {
  color: #21b9ff;
}
a:hover {
  text-decoration: underline;
}
:not(sup) .hover-title {
  color: white;
}
img.gh-logo {
  border-radius: 100% !important;
  border: 1.5px solid white;
  width: 19px;
  background: white;
}
.projects-header h3 > img {
  width: 20px;
  vertical-align: baseline;
}
select,
input[type="text"] {
  color: #c0c0c0;
  border: none;
  vertical-align: middle;
  background-color: #25272a;
}
input[type="text"] {
  padding: 6px 8px;
}
select::-ms-expand {
  display: none;
}
/*select {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
}*/
select,
.inline-select {
  margin: 0px;
  padding: 3px 20px 2px 8px;
  margin-top: 2px;
}
#ci-project-info-table td,
#ci-project-info-table th {
  border: 2px solid #333a42;
}
#ci-project-info-table tr:nth-child(2n) {
  background-color: #343434;
}
#ci-project-history-table td,
#ci-project-history-table th {
  border: 2px solid #333a42;
}
#ci-project-history-table tr:nth-child(2n+1) {
  background-color: #343434;
}
code,
pre code {
  padding: .2rem .4rem !important;
  color: ghostwhite;
  background-color: #343434;
  border-radius: .25rem !important;
}
.brief-info {
  background-color: #25272a;
  margin: 0px;
}
.repo-toggle {
  background-color: #333a42;
  padding: initial;
}
.repo-toggle > h5 {
  text-align: center;
  line-height: 1.7;
  margin-bottom: initial;
}
.repo-toggle > nobr {
  text-align: center;
  padding: 0px 10px 10px 10px;
}
.paginate-pagination ul > li > a.page {
  background: #25272a;
  border: none;
  color: white;
}
.paginate-pagination ul > li > a.page.active {
  background-color: #4183c4;
}
.paginate-pagination ul > li > a.page:not(.active):hover {
  background-color: #333;
}
.plugin-entry {
  background-color: #25272a;
  border: none;
}
.plugin-index .plugin-entry .plugin-entry-block.plugin-icon {
  background-color: #333a42;
}
.ui-widget-content {
  background: #333a42;
  color: inherit;
}
.remark {
  color: inherit;
}
.alert-warning {
  background-color: #fcf8e3;
  border-color: #faf2cc;
  color: #8a6d3b;
}
.ui-tabs {
  padding: 0px;
}
.ui-widget.ui-widget-content {
  border: none;
}
.ui-widget-header {
  background: #25272a;
  border: none;
}
.ui-tabs .ui-tabs-nav {
  padding: 0px;
}
.ui-tabs .ui-tabs-nav li.ui-tabs-active {
  margin-bottom: 0px;
  padding-bottom: 0px;
}
.ui-tabs .ui-tabs-nav li {
  margin-left: 0px;
  margin-right: 0px;
  border: none;
  background-color: #25272a;
}
.ui-tabs .ui-tabs-nav li:hover {
  background-color: #333;
}
.ui-state-default a,
.ui-state-default a:link,
.ui-state-default a:visited,
a.ui-button,
a:link.ui-button,
a:visited.ui-button,
.ui-button {
  color: white;
}
.ui-state-active,
.ui-widget-content .ui-state-active,
.ui-widget-header .ui-state-active,
a.ui-button:active,
.ui-button:active,
.ui-button.ui-state-active:hover {
  border: none;
  background-color: #4183c4 !important;
}
.account-tab {
  overflow: auto;
}
.ui-widget-content a {
  color: #21b9ff;
}
.submotto {
  color: white;
  font-weight: bold;
}
.wrapper-header {
  background-color: #25272a !important;
  margin-left: 10px !important;
}
.plugin-info {
  background-color: #25272a;
}
.plugin-info-description {
  background-color: #333a42;
}
.plugin-info-wrapper {
  background-color: #333a42;
}
.plugin-info-shields {
  background-color: #333a42;
}
.plugin-info-changelog {
  background-color: #333a42;
}
hr {
  border: 1px solid #323840;
}
.review-outer-wrapper {
  background-color: #323941;
  margin: 5px 0px;
  padding: 10px 10px 0 10px;
}
.review-panel {
  border: none;
}
.review-panel::before {
  content: "Reviews";
  font-size: 1rem;
  margin-bottom: .5rem;
  font-family: inherit;
  font-weight: 500;
  line-height: 1.1;
  color: inherit;
}
.review-replies {
  padding: 5px 0px 5px 15px;
}
.resptable-col {
  display: initial;
  padding-right: initial;
  margin-right: 20px;
}
.multisearch {
  margin-right: 20px;
}
.toggle-wrapper {
  background-color: #25272a;
}
.toggle-light .toggle-blob {
  background: #4183c4;
  border: 1px solid #0275c7;
}
.toggle-light .toggle-off,
.toggle-light .toggle-select .toggle-on {
  background: #f76150;
  color: initial;
}
.toggle-light .toggle-on,
.toggle-light .toggle-select .toggle-inner .active {
  background: #8ddb8d;
  color: initial;
}
.toggle-light .toggle-slide {
  box-shadow: initial;
}
/* Now, let's darken the scrollbar */
::-webkit-scrollbar {
  width: 14px;
  height: 3px;
}
::-webkit-scrollbar-button {
  background-color: #38383D;
}
/*Unreported webkit bug: arrows missing https://stackoverflow.com/questions/47576815/how-to-add-arrows-with-webkit-scrollbar-button */
::-webkit-scrollbar-track {
  background-color: #38383D;
}
::-webkit-scrollbar-track-piece {
  background-color: #000;
}
::-webkit-scrollbar-thumb {
  height: 50px;
  background-color: #737373;
  border-radius: 0px;
}
::-webkit-scrollbar-corner {
  background-color: #646464;
}
::-webkit-resizer {
  background-color: #666;
}
/* Firefox wants some special cake -.- */
* {
  scrollbar-color: #737373 #38383D;
  scrollbar-color: dark;
}

Please add this for dark dropdown menues

.release-filter-select {
    background-color: #292b2c !important;
}

@jasonwynn10 those filter apply a custom color tag on the element (for reasons unknown), that's why i haven't added it before, i wanted to keep this poggit "feature"

Turned the "Add Repo" interface dark now!

Reuploaded it to userstyles.org: https://userstyles.org/styles/174770/poggit-dark-oc

Add this for a dark scrollbar

::-webkit-scrollbar { width: 14px; height: 3px;}
::-webkit-scrollbar-button {  background-color: #666; }
::-webkit-scrollbar-track {  background-color: #646464;}
::-webkit-scrollbar-track-piece { background-color: #000;}
::-webkit-scrollbar-thumb { height: 50px; background-color: #666; border-radius: 0px;}
::-webkit-scrollbar-corner { background-color: #646464;}
::-webkit-resizer { background-color: #666;}

@jasonwynn10 done, also added firefox support. Due to a webkit bug, that appears not to be written down anywhere, the scrollbar arrow buttons are gone though. (see https://stackoverflow.com/questions/47576815/how-to-add-arrows-with-webkit-scrollbar-button)

Moved to https://github.com/thebigsmileXD/poggit-dark-css ! With updated meta to check for updates. Please reinstall this style