init test branch

public/assets/css/default.css

@@ -0,0 +1,9 @@
+:root {
+    --font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
+}
+
+* {
+    box-sizing: border-box;
+    margin: 0;
+    padding: 0;
+}