Fix dark mode

src/registrar/assets/sass/_theme/_admin.scss

@@ -79,6 +79,49 @@
         "Noto Color Emoji";
 }
 
+// Fold dark theme settings into our main CSS
+// https://docs.djangoproject.com/en/4.2/ref/contrib/admin/#theming-support > dark theme note
+@media (prefers-color-scheme: dark) {
+    :root,
+    html[data-theme="dark"] {
+      // Edit the primary to meet accessibility requ.  
+      --primary: #23485a;
+      --primary-fg: #f7f7f7;
+  
+      --body-fg: #eeeeee;
+      --body-bg: #121212;
+      --body-quiet-color: #e0e0e0;
+      --body-loud-color: #ffffff;
+  
+      --breadcrumbs-link-fg: #e0e0e0;
+      --breadcrumbs-bg: var(--primary);
+  
+      --link-fg: #81d4fa;
+      --link-hover-color: #4ac1f7;
+      --link-selected-fg: #6f94c6;
+  
+      --hairline-color: #272727;
+      --border-color: #353535;
+  
+      --error-fg: #e35f5f;
+      --message-success-bg: #006b1b;
+      --message-warning-bg: #583305;
+      --message-error-bg: #570808;
+  
+      --darkened-bg: #212121;
+      --selected-bg: #1b1b1b;
+      --selected-row: #00363a;
+  
+      --close-button-bg: #333333;
+      --close-button-hover-bg: #666666;
+    }
+
+    // Fix dark mode bug    
+    body {
+        color: var(--body-fg)!important;
+    }
+}
+
 #branding h1 a:link, #branding h1 a:visited {
     color: var(--primary-fg);
 }