Add background image and styling improvements for artist cards

assets/css/main.css

@@ -1,5 +1,13 @@
 @import "tailwindcss";
 
+body {
+    font-family: 'Poppins';
+}
+
+.container {
+    @apply max-w-4/5 mx-auto;
+}
+
 .btn-primary {
     @apply bg-blue-600 text-white px-4 py-2 rounded;
 }