diff --git a/README.md b/README.md
index 76b4499..025ce41 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@ and pairing with smart people at Hashrocket.
 
 For a steady stream of TILs, [sign up for my newsletter](https://tinyletter.com/jbranchaud).
 
-_885 TILs and counting..._
+_886 TILs and counting..._
 
 ---
 
@@ -95,6 +95,7 @@ _885 TILs and counting..._
 - [Add Fab Icons To Your Site With FontAwesome 5](css/add-fab-icons-to-your-site-with-fontawesome-5.md)
 - [Animate Smoothly Between Two Background Colors](css/animate-smoothly-between-two-background-colors.md)
 - [Apply Multiple Box Shadows To Single Element](css/apply-multiple-box-shadows-to-single-element.md)
+- [Apply Styles Based On Dark-Mode Preferences](css/apply-styles-based-on-dark-mode-preferences.md)
 - [Apply Styles To The Last Child Of A Specific Type](css/apply-styles-to-the-last-child-of-a-specific-type.md)
 - [Change The Orientation Of An Image](css/change-the-orientation-of-an-image.md)
 - [Circular Icons With A Massive Border Radius](css/circular-icons-with-a-massive-border-radius.md)
diff --git a/css/apply-styles-based-on-dark-mode-preferences.md b/css/apply-styles-based-on-dark-mode-preferences.md
new file mode 100644
index 0000000..9307f52
--- /dev/null
+++ b/css/apply-styles-based-on-dark-mode-preferences.md
@@ -0,0 +1,23 @@
+# Apply Styles Based On Dark-Mode Preferences
+
+There is a CSS media query for whether a user prefers a Dark-Mode or Light-Mode
+color scheme. If you're site is able to provide styling for both modes, then
+you can hook into those preferences like so:
+
+```css
+@media (prefers-color-scheme: dark) {
+  /* dark-mode styles */
+  /* perhaps changing some custom properties */
+}
+
+@media (prefers-color-scheme: light) {
+  /* light-mode styles */
+  /* perhaps changing some custom properties */
+}
+```
+
+As of this writing,
+[`prefers-color-scheme`](https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-color-scheme)
+is still in a draft state, but it already has decent browser support.
+
+[source](https://24ways.org/2019/interactivity-and-animation-with-variable-fonts/)