Update css files

src/index.css

@@ -7,28 +7,26 @@
 }
 
 
+:root.dark {
+	--text-color: #FFFFFFDE;
+	--bg-color: var(--color-neutral-825);
+}
+
+:root.light {
+	--text-color: #213547;
+	--bg-color: #FFFFFF;
+}
+
 :root {
 	font-family: Inter, system-ui, Avenir, Helvetica, Arial, sans-serif;
-	line-height: 1.5;
-	font-weight: 400;
-
-	color-scheme: light dark;
-	color: #213547;
-	background-color: #ffffff;
 
 	font-synthesis: none;
 	text-rendering: optimizeLegibility;
 	-webkit-font-smoothing: antialiased;
 	-moz-osx-font-smoothing: grayscale;
-}
 
-:root.dark {
-	color: rgba(255, 255, 255, 0.87);
-	background-color: var(--color-neutral-825);
-}
-
-a {
-	text-decoration: inherit;
+	background-color: var(--bg-color);
+	color: var(--text-color);
 }
 
 a.active {
@@ -36,19 +34,38 @@ a.active {
 }
 
 body {
-	margin: 0;
 	display: flex;
 	place-items: center;
 	min-width: 320px;
 	min-height: 100vh;
-}
+	max-width: var(--breakpoint-2xl);
 
-h1 {
-	font-size: 3.2em;
-	line-height: 1.1;
+	margin-top: 82px;
+	margin-inline: auto;
+	padding-inline: 1rem;
+
+	text-align: center;
 }
 
 button {
-	font-family: inherit;
 	cursor: pointer;
 }
+
+nav {
+	position: fixed;
+	top: 0;
+	left: 0;
+	width: 100%;
+}
+
+.navContents {
+	display: flex;
+	flex-direction: row;
+	flex-wrap: nowrap;
+	align-items: center;
+	justify-content: space-between;
+	max-width: var(--breakpoint-2xl);
+
+	margin-inline: auto;
+	padding: 1rem;
+}