diff --git a/CHANGELOG.md b/CHANGELOG.md
index 47b831c740..ef7eec146e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
 ## Version `v0.27.25`
 
 * ![Bugfix][badge-bugfix] Page headings are now correctly escaped in `LaTeXWriter`. ([#2134][github-2134])
+* ![Bugfix][badge-bugfix] Compiling the dark theme with Sass no longer emits deprecation warnings about `!global` assignments. ([#1766][github-1766], [#1983][github-1983], [#2145][github-2145])
 
 ## Version `v0.27.24`
 
@@ -1058,6 +1059,7 @@
 [github-1759]: https://github.com/JuliaDocs/Documenter.jl/pull/1759
 [github-1760]: https://github.com/JuliaDocs/Documenter.jl/issues/1760
 [github-1762]: https://github.com/JuliaDocs/Documenter.jl/pull/1762
+[github-1766]: https://github.com/JuliaDocs/Documenter.jl/issues/1766
 [github-1770]: https://github.com/JuliaDocs/Documenter.jl/issues/1770
 [github-1771]: https://github.com/JuliaDocs/Documenter.jl/pull/1771
 [github-1772]: https://github.com/JuliaDocs/Documenter.jl/issues/1772
@@ -1102,8 +1104,10 @@
 [github-1886]: https://github.com/JuliaDocs/Documenter.jl/pull/1886
 [github-1908]: https://github.com/JuliaDocs/Documenter.jl/pull/1908
 [github-1909]: https://github.com/JuliaDocs/Documenter.jl/pull/1909
+[github-1983]: https://github.com/JuliaDocs/Documenter.jl/issues/1983
 [github-2018]: https://github.com/JuliaDocs/Documenter.jl/pull/2018
 [github-2134]: https://github.com/JuliaDocs/Documenter.jl/pull/2134
+[github-2145]: https://github.com/JuliaDocs/Documenter.jl/pull/2145
 <!-- end of issue link definitions -->
 
 [julia-38054]: https://github.com/JuliaLang/julia/issues/38054
diff --git a/assets/html/scss/documenter-dark.scss b/assets/html/scss/documenter-dark.scss
index 3c58bae5b1..6477f5197b 100644
--- a/assets/html/scss/documenter-dark.scss
+++ b/assets/html/scss/documenter-dark.scss
@@ -34,6 +34,11 @@ $admonition-background: (
   'danger': $background, 'compat': $background
 );
 $admonition-header-background: ('default': $grey);
+// These would normally get initialized in _admonition.scss. However, since we are not
+// loading it on the top level, we need to set them here too to avoid deprecation warnings.
+// https://github.com/JuliaDocs/Documenter.jl/issues/1766
+$admonition-header-color: ();
+$admonition-body-color: ();
 
 $body-size: 16px;
 $documenter-sidebar-background: $grey-darker;
diff --git a/assets/html/themes/documenter-dark.css b/assets/html/themes/documenter-dark.css
index 0bf1af7d5e..26a02d0f1f 100644
--- a/assets/html/themes/documenter-dark.css
+++ b/assets/html/themes/documenter-dark.css
@@ -7143,33 +7143,52 @@ html.theme--documenter-dark {
       background-color: #282f2f;
       border-color: #5e6d6f; }
       html.theme--documenter-dark .admonition.is-default > .admonition-header {
-        background-color: #5e6d6f; }
+        background-color: #5e6d6f;
+        color: #fff; }
+      html.theme--documenter-dark .admonition.is-default > .admonition-body {
+        color: #fff; }
     html.theme--documenter-dark .admonition.is-info {
       background-color: #282f2f;
       border-color: #024c7d; }
       html.theme--documenter-dark .admonition.is-info > .admonition-header {
-        background-color: #024c7d; }
+        background-color: #024c7d;
+        color: #fff; }
+      html.theme--documenter-dark .admonition.is-info > .admonition-body {
+        color: #fff; }
     html.theme--documenter-dark .admonition.is-success {
       background-color: #282f2f;
       border-color: #008438; }
       html.theme--documenter-dark .admonition.is-success > .admonition-header {
-        background-color: #008438; }
+        background-color: #008438;
+        color: #fff; }
+      html.theme--documenter-dark .admonition.is-success > .admonition-body {
+        color: #fff; }
     html.theme--documenter-dark .admonition.is-warning {
       background-color: #282f2f;
       border-color: #ad8100; }
       html.theme--documenter-dark .admonition.is-warning > .admonition-header {
-        background-color: #ad8100; }
+        background-color: #ad8100;
+        color: #fff; }
+      html.theme--documenter-dark .admonition.is-warning > .admonition-body {
+        color: #fff; }
     html.theme--documenter-dark .admonition.is-danger {
       background-color: #282f2f;
       border-color: #9e1b0d; }
       html.theme--documenter-dark .admonition.is-danger > .admonition-header {
-        background-color: #9e1b0d; }
+        background-color: #9e1b0d;
+        color: #fff; }
+      html.theme--documenter-dark .admonition.is-danger > .admonition-body {
+        color: #fff; }
     html.theme--documenter-dark .admonition.is-compat {
       background-color: #282f2f;
       border-color: #137886; }
       html.theme--documenter-dark .admonition.is-compat > .admonition-header {
-        background-color: #137886; }
+        background-color: #137886;
+        color: #fff; }
+      html.theme--documenter-dark .admonition.is-compat > .admonition-body {
+        color: #fff; }
   html.theme--documenter-dark .admonition-header {
+    color: #fff;
     background-color: #5e6d6f;
     align-items: center;
     font-weight: 700;
@@ -7240,6 +7259,7 @@ html.theme--documenter-dark {
     box-shadow: 0 0 10px rgba(0, 0, 0, 0.3);
     z-index: 999;
     background-color: #282f2f;
+    color: #fff;
     border-bottom: 3px solid #9e1b0d;
     padding: 10px 35px;
     text-align: center;