Add fallback font

tailwind.config.js

@@ -1,9 +1,27 @@
+const colors = require("tailwindcss/");
+
 /** @type {import('tailwindcss').Config} */
 module.exports = {
   content: ["content/**/*.md", "layouts/**/*.html"],
   theme: {
     fontFamily: {
-      main: "Spline Sans",
+      main: [
+        "Spline Sans",
+        "ui-sans-serif",
+        "system-ui",
+        "-apple-system",
+        "BlinkMacSystemFont",
+        '"Segoe UI"',
+        "Roboto",
+        '"Helvetica Neue"',
+        "Arial",
+        '"Noto Sans"',
+        "sans-serif",
+        '"Apple Color Emoji"',
+        '"Segoe UI Emoji"',
+        '"Segoe UI Symbol"',
+        '"Noto Color Emoji"',
+      ],
     },
     fontWeight: {
       bold: 700,