diff --git a/docs/_static/custom.css b/docs/_static/custom.css
index c759ee20f6..581a39cbb2 100644
--- a/docs/_static/custom.css
+++ b/docs/_static/custom.css
@@ -105,6 +105,10 @@
     padding: 40px;
 }
 
+.bd-container {
+    padding-top: var(--pst-header-height);
+}
+
 .section p {
     line-height: 1.8rem;
 }
@@ -185,3 +189,24 @@ dt:target, span.highlighted {
     max-width: 100%;
     font-size: 0.9rem;
 }
+
+html[data-theme="dark"] {
+    --pst-color-text-base: var(--pst-color-text-muted);
+    --pst-color-sidebar-link-active: var(--pst-color-link);
+}
+
+html[data-theme="dark"] .container-xl {
+    background-color: #3B3B3B;
+}
+
+html[data-theme="dark"] .editthispage a {
+    color: var(--pst-color-link);
+}
+
+html[data-theme="dark"] .bd-sidebar {
+    border-right: 3px solid #ffffff1a;
+}
+
+html[data-theme="dark"] .navbar-light>.container-xl {
+    background-color: var(--pst-color-surface);
+}
diff --git a/docs/about/whats_new.rst b/docs/about/whats_new.rst
index b8a8f0b0bd..036159269d 100644
--- a/docs/about/whats_new.rst
+++ b/docs/about/whats_new.rst
@@ -9,6 +9,7 @@ v1.9.next
 =========
 
 - Fix typos in docs (:pull:`1577`)
+- Merge in 1.8.x branch changes. (:pull:`1568`, :pull:`1579`)
 
 v1.9.0-rc4 (15th April 2024)
 ============================
@@ -66,8 +67,11 @@ v1.9.0-rc1 (27th March 2024)
 v1.8.next
 =========
 
+- Update readthedocs stylesheet for dark theme (:pull:`1579`)
+
 v1.8.18 (27th March 2024)
 =========================
+
 - Add dataset cli tool ``find-duplicates`` to identify duplicate indexed datasets (:pull:`1517`)
 - Make solar_day() timezone aware (:pull:`1521`)
 - Warn if non-eo3 dataset has eo3 metadata type (:pull:`1523`)
diff --git a/wordlist.txt b/wordlist.txt
index 88e497a6aa..836b87d7c3 100644
--- a/wordlist.txt
+++ b/wordlist.txt
@@ -441,6 +441,7 @@ stacker
 stacspec
 stdlib
 str
+stylesheet
 subcommands
 sudo
 sv