fix light weight

Author: silverwind

web_src/css/base.css

@@ -4,7 +4,7 @@
   --fonts-monospace: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace, var(--fonts-emoji);
   --fonts-emoji: "Apple Color Emoji", "Segoe UI Emoji", "Noto Color Emoji", "Twemoji Mozilla";
   /* font weights */
-  --font-weight-light: 400;
+  --font-weight-light: 300;
   --font-weight-normal: 400;
   --font-weight-medium: 500;
   --font-weight-semibold: 600;