diff --git a/.vscode/css_custom_data.json b/.vscode/css_custom_data.json
new file mode 100644
index 0000000..cdcd61e
--- /dev/null
+++ b/.vscode/css_custom_data.json
@@ -0,0 +1,34 @@
+{
+  "atDirectives": [
+    {
+      "name": "@tailwind",
+      "description": "Use the @tailwind directive to insert Tailwind’s `base`, `components`, `utilities`, and `screens` styles into your CSS.",
+      "references": [
+        {
+          "name": "Tailwind’s “Functions & Directives” documentation",
+          "url": "https://tailwindcss.com/docs/functions-and-directives/#tailwind"
+        }
+      ]
+    },
+    {
+      "name": "@apply",
+      "description": "Use @apply to inline any existing utility classes into your own custom CSS.",
+      "references": [
+        {
+          "name": "Tailwind’s “Functions & Directives” documentation",
+          "url": "https://tailwindcss.com/docs/functions-and-directives/#apply"
+        }
+      ]
+    },
+    {
+      "name": "@layer",
+      "description": "Use the @layer directive to tell Tailwind which \"bucket\" a set of custom styles belong to. Valid layers are a base, components, and utilities.",
+      "references": [
+        {
+          "name": "Tailwind’s “Functions & Directives” documentation",
+          "url": "https://tailwindcss.com/docs/functions-and-directives/#layer"
+        }
+      ]
+    }
+  ]
+}
\ No newline at end of file
diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..7058fcc
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,3 @@
+{
+  "css.customData": [".vscode/css_custom_data.json"],
+}
\ No newline at end of file
diff --git a/public/index.html b/public/index.html
index 51f0ffa..c8d00fa 100644
--- a/public/index.html
+++ b/public/index.html
@@ -12,7 +12,7 @@
     <link rel="apple-touch-icon" href="%PUBLIC_URL%/logo192.png" />
     <link rel="preconnect" href="https://fonts.gstatic.com" />
     <link
-      href="https://fonts.googleapis.com/css2?family=Open+Sans:wght@300;400;600;700&family=Roboto:wght@100;300;400;500;700&display=swap"
+      href="https://fonts.googleapis.com/css2?family=Source+Sans+Pro:ital,wght@0,300;0,400;0,600;0,700;0,900;1,400&display=swap"
       rel="stylesheet"
     />
     <!--
diff --git a/src/index.css b/src/index.css
index a3fdb4a..77f21c4 100644
--- a/src/index.css
+++ b/src/index.css
@@ -17,3 +17,12 @@ code {
 @tailwind base;
 @tailwind components;
 @tailwind utilities;
+
+@layer components {
+  .btn {
+    @apply mx-4 my-1 bg-gray-100 rounded-md w-32 h-10 border-transparent hover:bg-gray-200;
+  }
+  .btn:disabled {
+    @apply opacity-60 hover:bg-gray-100 cursor-default;
+  }
+}
diff --git a/tailwind.config.js b/tailwind.config.js
index 33167ad..2d1060e 100644
--- a/tailwind.config.js
+++ b/tailwind.config.js
@@ -2,7 +2,12 @@ module.exports = {
   purge: ['./src/**/*.{js,jsx,ts,tsx}', './public/index.html'],
   darkMode: false, // or 'media' or 'class'
   theme: {
-    extend: {},
+    extend: {
+      fontFamily: {
+        sans:
+          '"Source Sans Pro", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji"',
+      },
+    },
   },
   variants: {
     extend: {},