feat: add css for dark mode

src/app.css

@@ -1,8 +1,30 @@
 @import "@fontsource-variable/inter";
 @import "@fontsource-variable/inter/wght-italic.css";
 
+:root {
+	--background-color: white;
+	--text-color: black;
+	--accent-color: #0077b8;
+	color-scheme: light;
+}
+
+@media (prefers-color-scheme: dark) {
+	:root {
+		--background-color: #16191d;
+		--text-color: #f8f9fa;
+		--accent-color: #a5d8ff;
+		color-scheme: dark;
+	}
+}
+
 body {
 	font-family: "Inter Variable", sans-serif;
+	background-color: var(--background-color);
+	color: var(--text-color);
+}
+
+a {
+	color: var(--accent-color);
 }
 
 .contents {

src/routes/results/+page.svelte

@@ -56,7 +56,7 @@
 
 <style>
 	td {
-		border: 1px solid black;
+		border: 1px solid var(--text-color);
 		padding: 8px 10px;
 	}