Adds Hacker News dark mode userstyle

Userstyles/Hacker News Dark.css

@@ -0,0 +1,91 @@
+@-moz-document domain("news.ycombinator.com") {
+body {
+    background-color: #262626 !important;
+}
+
+body > center > table, input, textarea {
+    background-color: #222 !important;
+}
+
+body > center > table > tbody > tr:first-child > td {
+    background-color: #ff6600 !important;
+}
+
+/* Bright text */
+td.title a:link, 
+span.comment font, 
+span.comment font a:link, 
+u a:link, 
+span.yclinks a:link, 
+body:not([id]),
+td:nth-child(2):not(.subtext) > a:link, 
+input, 
+textarea, 
+p > a, 
+a > u, 
+.c00, 
+.c00 a:link,
+a[href="http://www.ycombinator.com/apply/"], 
+a[href="https://www.ycombinator.com/apply/"] {
+    color: #dee2e6 !important;
+}
+
+.admin td {
+    color: #aaa !important;
+}
+
+/* search box and comment box */
+input, textarea {
+    border: 1px solid #828282 !important;
+}
+
+.votearrow {
+    position: relative;
+    background: none;
+    margin: 4px 10px;
+}
+
+.votearrow::after {
+    content: '';
+    position: absolute;
+    top: 2px;
+    left: 0;
+    width: 0;
+    height: 0;
+    border-left: 5px solid transparent;
+    border-right: 5px solid transparent;
+    border-bottom: 9px solid #ccc;
+}
+
+a.nosee {
+    visibility: visible;
+}
+
+a.nosee .votearrow::after {
+    border-left: 5px solid transparent;
+    border-right: 5px solid transparent;
+    border-bottom: 9px solid #ff6600;
+}
+
+.title {
+    font-family: Inter, sans-serif;
+    font-size: 16px;
+}
+
+.subtext {
+  font-family: Inter, sans-serif;
+  font-size: 12px;
+  color: #aaa;
+  padding-top: 5px;
+}
+
+tr.spacer {
+    height: 10px !important;
+}
+
+.comment {
+    font-family: Inter, sans-serif;
+    font-size: 14px;
+    line-height: 1.25rem;
+}
+}