Improve 404 page.

src/styles/404.module.css

@@ -0,0 +1,34 @@
+#notFound {
+	margin: 50px 20px;
+	display: flex;
+	padding: 60px 30px;
+	border-radius: 20px;
+	background: #1d2e3d;
+	align-items: center;
+	gap: 5px;
+	justify-content: center;
+	text-align: center;
+	flex-direction: column;
+	box-shadow: rgba(0, 0, 0, 0.5) 2px 10px 15px;
+}
+
+#notFound a {
+	color: var(--text-primary);
+}
+
+#header {
+	font-size: 3em;
+}
+
+#description {
+	font-size: 1.3em;
+	width: 50%;
+}
+
+@media (min-width: 800px) {
+	.notFound {
+		width: 60vw;
+		border-radius: 20px;
+		height: 65vh;
+	}
+}