diff --git a/qt/aqt/stats.py b/qt/aqt/stats.py
index d1bdb93e5..747054d21 100644
--- a/qt/aqt/stats.py
+++ b/qt/aqt/stats.py
@@ -9,6 +9,7 @@ import time
 import aqt
 from anki.lang import _
 from aqt.qt import *
+from aqt.theme import theme_manager
 from aqt.utils import (
     addCloseShortcut,
     getSaveFile,
@@ -87,4 +88,8 @@ class DeckStats(QDialog):
 
     def refresh(self):
         self.form.web.set_open_links_externally(False)
-        self.form.web.load(QUrl(f"{self.mw.serverURL()}_anki/graphs.html"))
+        if theme_manager.night_mode:
+            extra = "#night"
+        else:
+            extra = ""
+        self.form.web.load(QUrl(f"{self.mw.serverURL()}_anki/graphs.html"+extra))
diff --git a/ts/css.d.ts b/ts/css.d.ts
index cbe652dbe..0292a33a0 100644
--- a/ts/css.d.ts
+++ b/ts/css.d.ts
@@ -1 +1 @@
-declare module "*.css";
+declare module "*.scss";
diff --git a/ts/package.json b/ts/package.json
index 91ed8c38f..4f73e7715 100644
--- a/ts/package.json
+++ b/ts/package.json
@@ -31,6 +31,7 @@
         "prettier": "^2.0.0",
         "prettier-plugin-svelte": "^1.1.0",
         "sass": "^1.26.9",
+        "sass-loader": "^8.0.2",
         "style-loader": "^1.2.1",
         "svelte": "^3.23.2",
         "svelte-loader": "^2.13.6",
diff --git a/ts/src/html/graphs.html b/ts/src/html/graphs.html
index 9ed95ba15..d06ae769c 100644
--- a/ts/src/html/graphs.html
+++ b/ts/src/html/graphs.html
@@ -8,6 +8,10 @@
         <div id="main"></div>
     </body>
     <script>
-        anki.graphs(document.getElementById("main"));
+        const nightMode = window.location.hash == "#night";
+        if (nightMode) {
+            document.body.className = "night-mode";
+        }
+        anki.graphs(document.getElementById("main"), nightMode);
     </script>
 </html>
diff --git a/ts/src/stats/CalendarGraph.svelte b/ts/src/stats/CalendarGraph.svelte
index b75e01822..41f2f6f29 100644
--- a/ts/src/stats/CalendarGraph.svelte
+++ b/ts/src/stats/CalendarGraph.svelte
@@ -11,6 +11,7 @@
     export let sourceData: pb.BackendProto.GraphsOut | null = null;
     export let revlogRange: RevlogRange = RevlogRange.Month;
     export let i18n: I18n;
+    export let nightMode: boolean;
 
     let graphData: GraphData | null = null;
 
@@ -42,7 +43,14 @@
     }
 
     $: if (graphData) {
-        renderCalendar(svg as SVGElement, bounds, graphData, targetYear, i18n);
+        renderCalendar(
+            svg as SVGElement,
+            bounds,
+            graphData,
+            targetYear,
+            i18n,
+            nightMode
+        );
     }
 
     const title = i18n.tr(i18n.TR.STATISTICS_REVIEWS_TITLE);
diff --git a/ts/src/stats/GraphsPage.svelte b/ts/src/stats/GraphsPage.svelte
index f8a42f4b5..4aba44c70 100644
--- a/ts/src/stats/GraphsPage.svelte
+++ b/ts/src/stats/GraphsPage.svelte
@@ -1,5 +1,5 @@
 <script context="module">
-    import style from "./graphs.css";
+    import style from "./graphs.scss";
 </script>
 
 <script lang="typescript">
@@ -20,6 +20,7 @@
     import CalendarGraph from "./CalendarGraph.svelte";
 
     export let i18n: I18n;
+    export let nightMode: boolean;
 
     let sourceData: pb.BackendProto.GraphsOut | null = null;
 
@@ -142,7 +143,7 @@
 
 <TodayStats {sourceData} {i18n} />
 <CardCounts {sourceData} {i18n} />
-<CalendarGraph {sourceData} {revlogRange} {i18n} />
+<CalendarGraph {sourceData} {revlogRange} {i18n} {nightMode} />
 <FutureDue {sourceData} {revlogRange} {i18n} />
 <ReviewsGraph {sourceData} {revlogRange} {i18n} />
 <IntervalsGraph {sourceData} {i18n} />
diff --git a/ts/src/stats/buttons.ts b/ts/src/stats/buttons.ts
index 83f2100d0..e7ce57d90 100644
--- a/ts/src/stats/buttons.ts
+++ b/ts/src/stats/buttons.ts
@@ -154,9 +154,9 @@ export function renderButtons(
             .attr("opacity", (d: Datum) => {
                 switch (d.group) {
                     case "learning":
-                        return 0.3;
+                        return 0.6;
                     case "young":
-                        return 0.5;
+                        return 0.8;
                     case "mature":
                         return 1;
                 }
diff --git a/ts/src/stats/calendar.ts b/ts/src/stats/calendar.ts
index e9ba26f18..208f164a0 100644
--- a/ts/src/stats/calendar.ts
+++ b/ts/src/stats/calendar.ts
@@ -53,7 +53,8 @@ export function renderCalendar(
     bounds: GraphBounds,
     sourceData: GraphData,
     targetYear: number,
-    i18n: I18n
+    i18n: I18n,
+    nightMode: boolean
 ): void {
     const svg = select(svgElem);
     const now = new Date();
@@ -101,7 +102,11 @@ export function renderCalendar(
         }
     }
     const data = Array.from(dayMap.values());
-    const blues = scaleSequential(interpolateBlues).domain([0, maxCount]);
+    const cappedRange = scaleLinear().range([0.2, nightMode ? 0.8 : 1]);
+    const blues = scaleSequential((n) => interpolateBlues(cappedRange(n))).domain([
+        0,
+        maxCount,
+    ]);
 
     function tooltipText(d: DayDatum): string {
         const date = d.date.toLocaleString(i18n.langs, {
@@ -115,6 +120,10 @@ export function renderCalendar(
     }
 
     const height = bounds.height / 10;
+    let emptyColour = "#eee";
+    if (nightMode) {
+        emptyColour = "#333";
+    }
     svg.select(`g.days`)
         .selectAll("rect")
         .data(data)
@@ -132,7 +141,7 @@ export function renderCalendar(
         .on("mouseout", hideTooltip)
         .attr("fill", (d) => {
             if (d.count === 0) {
-                return "#eee";
+                return emptyColour;
             } else {
                 return blues(d.count);
             }
diff --git a/ts/src/stats/graphs-bootstrap.ts b/ts/src/stats/graphs-bootstrap.ts
index 42ddfd7b0..40b21a146 100644
--- a/ts/src/stats/graphs-bootstrap.ts
+++ b/ts/src/stats/graphs-bootstrap.ts
@@ -4,11 +4,11 @@
 import { setupI18n } from "../i18n";
 import GraphsPage from "./GraphsPage.svelte";
 
-export function graphs(target: HTMLDivElement): void {
+export function graphs(target: HTMLDivElement, nightMode: boolean): void {
     setupI18n().then((i18n) => {
         new GraphsPage({
             target,
-            props: { i18n },
+            props: { i18n, nightMode },
         });
     });
 }
diff --git a/ts/src/stats/graphs.css b/ts/src/stats/graphs.scss
similarity index 72%
rename from ts/src/stats/graphs.css
rename to ts/src/stats/graphs.scss
index 11e363076..187344f9f 100644
--- a/ts/src/stats/graphs.css
+++ b/ts/src/stats/graphs.scss
@@ -1,9 +1,16 @@
+$day-fg: black;
+$day-bg: white;
+$night-fg: white;
+$night-bg: #222;
+
 * {
     box-sizing: border-box;
 }
 
 body {
     font-family: Arial;
+    background: $day-bg;
+    color: $day-fg;
 }
 
 .graph-tooltip {
@@ -15,7 +22,8 @@ body {
     opacity: 0;
     pointer-events: none;
     transition: opacity 0.3s;
-    background: #fff;
+    color: $day-fg;
+    background: $day-bg;
 }
 
 .graph {
@@ -37,7 +45,8 @@ body {
     top: 0;
     width: 100%;
     height: 4em;
-    background: white;
+    color: $day-fg;
+    background: $day-bg;
     padding: 0.5em;
 }
 
@@ -57,7 +66,7 @@ body {
 .graph .area {
     opacity: 0.05;
     pointer-events: none;
-    fill: black;
+    fill: $day-fg;
 }
 
 .axis-label {
@@ -110,3 +119,23 @@ body {
 .subtitle {
     text-align: center;
 }
+
+body.night-mode {
+    background: $night-bg;
+    color: $night-fg;
+}
+
+.night-mode {
+    .graph-tooltip {
+        background: $night-bg;
+        color: $night-fg;
+    }
+    .range-box {
+        background: $night-bg;
+        color: $night-fg;
+    }
+    .graph .area {
+        fill: $night-fg;
+        opacity: 0.1;
+    }
+}
diff --git a/ts/src/stats/graphs.ts b/ts/src/stats/graphs.ts
index facae054a..9a8896b28 100644
--- a/ts/src/stats/graphs.ts
+++ b/ts/src/stats/graphs.ts
@@ -40,6 +40,13 @@ export enum RevlogRange {
     All = 3,
 }
 
+export interface GraphsContext {
+    cards: pb.BackendProto.Card[];
+    revlog: pb.BackendProto.RevlogEntry[];
+    revlogRange: RevlogRange;
+    nightMode: boolean;
+}
+
 export interface GraphBounds {
     width: number;
     height: number;
diff --git a/ts/src/stats/hours.ts b/ts/src/stats/hours.ts
index 082d6bd88..e2b2d903d 100644
--- a/ts/src/stats/hours.ts
+++ b/ts/src/stats/hours.ts
@@ -74,7 +74,11 @@ export function renderHours(
         .transition(trans)
         .call(axisBottom(x).tickSizeOuter(0));
 
-    const colour = scaleSequential(interpolateBlues).domain([0, yMax]);
+    const cappedRange = scaleLinear().range([0.1, 0.8]);
+    const colour = scaleSequential((n) => interpolateBlues(cappedRange(n))).domain([
+        0,
+        yMax,
+    ]);
 
     // y scale
 
@@ -114,7 +118,7 @@ export function renderHours(
                     .attr("x", (d: Hour) => x(d.hour.toString())!)
                     .attr("y", y(0))
                     .attr("height", 0)
-                    .attr("opacity", 0.7)
+                    // .attr("opacity", 0.7)
                     .call(updateBar),
             (update) => update.call(updateBar),
             (remove) =>
diff --git a/ts/webpack.config.js b/ts/webpack.config.js
index a86b7063e..567b5348c 100644
--- a/ts/webpack.config.js
+++ b/ts/webpack.config.js
@@ -41,8 +41,8 @@ module.exports = {
     module: {
         rules: [
             {
-                test: /\.css$/i,
-                use: ["style-loader", "css-loader"],
+                test: /\.s?css$/i,
+                use: ["style-loader", "css-loader", "sass-loader"],
             },
             {
                 test: /\.(svelte)$/,